Interview TaskContext Problems-Multiplication Student
#1
Bob
has 4 boxes of crayons. Each box has
5 crayons in it. How many crayons
does he have altogether? |
Student Response 15,
25. No, 20. |
Thoughts/Comments
How
did you get 20? |
|
|
I
counted by 5 four times. |
Okay. |
|
Anna
has 3 boxes of cookies. Each box has
11 cookies in it. How many cookies
does she have altogether? |
33 |
Explain
to me how you figured that out? |
|
|
I
said 11+11=22 and 22+11=33 |
|
|
Interview Task John
has 18 boxes of marbles. Each box has
12 marbles in it. How many marbles
does he have altogether? |
Student Response
(He
thinks momentarily.) That’s hard. |
Thoughts/Comments
How
do you think you could figure out the answer? |
|
|
I
don’t know. Add 18+22. It’s
hard. |
Okay,
let’s try another one. |
|
John
has 14 boxes of marbles. Each box has
3 marbles in it. How many marbles
does he have altogether? |
9,
no 42. |
How
do you know? |
|
|
It’s
42 because you add 14+14+14. |
Okay,
let’s try a different type of problem. |
Interview Task
Context Problems-Division Shameka
has 16 bracelets that she wants to share with her sisters. If she gives 4 to each sister, how many
can she give to? |
Student Response
4 |
Thoughts/Comments
How do you know? |
|
|
I
counted down from 16 four times. |
Okay,
break it down for me. What did you
exactly do? |
|
|
16-4=12
,12-4=8, 8-4=4 |
Okay. |
|
Roshawn
has 54 toy trucks that he wants to share with his friends. If he gives 5 toy trucks to each friend,
how many can he give to? |
I’m
confused. |
About
what? |
Interview Task
|
Student Response
I
think I should count down from 54. |
Thoughts/Comments
What
do you mean count down? |
|
|
Subtract
5 from 54 each time. |
Okay,
try doing it and see what you get? |
|
|
(He
uses the frog manipulatives to count out 54 –counts by 5. Once he has 54, he takes away 5 each time
and loses count at 20. He then starts
over and counts out 54 by 10 until he gets to 40 and then begins to count by
1. After this, he subtracts 5 each
time recording his results with tally marks.) The
answer is 13. |
Okay. (I notice that he is looking at the two
that he has left over.) What are
those, leftovers? |
|
|
Yes,
2 are left over. |
|
|
Interview Task |
Student Response
|
Thoughts/Comments
I
know that the previous problem gave him trouble, but I wanted to see what he
really knows because he appears to have some knowledge of how to solve this
type of problem. |
|
|
He
draws out the ribbons. Each
rectangle equals 10. After he reaches 60, each rectangle equals
1. Is
the answer 6? |
How
did you get 6? |
|
|
I
know that 7+3=10 and 10+3=13. So, I
take 3 from 1 ten and add it to another 10 to make 13. |
Okay.
(I am somewhat understanding, but not I do not fully grasp the concept that
he is using.) So, what do you think the answer is? |
|
|
(He
counts the tally marks that he has made.) 6 |
Why
6? |
Interview Task
|
Student Response
Because 7+6=13 |
Thoughts/Comments
I
am confused, but I continue to ask him similar problems. |
|
Shawn
has 48 stickers and wants to give them to his friends. If he gives each one 8 stickers, how many
can he give stickers to? |
(He
draws circular symbols. Each one equals 10.
He writes 2 over one symbol and 8 over another. This is repeated.) I
think there is a pattern. |
What
pattern? |
|
|
It
goes 2, 8, 2. |
What
does this mean? |
|
|
I
don’t know. Let me start over. (He
begins to add 8+8+8+8+8+8.) 6 |
How
did you get 6? |
|
|
Because
8+8+8+8+8+8=48 |
He
has solved the problem, but I am still not clear on his rationale, so I ask
one more question. |
|
Paul
has 36 fair tickets and wants to give some to his friends. If he gives 6 to each of his friends, how
many of his friends can he give to? |
(He
begins to subtract.) (He
keeps track of how many times he subtracts 6 with tally marks.) 6 |
Why
is the answer 6? |
|
|
Because
36-6=30, 30-6=24, 24-6=18,
18-6=12, 12-6=6 |
I
decide to move on. |
|
Fractions What fraction of one
cookie will each person get if they share equally? 2
cookies among 4 people. |
(He
divides the cookies that I have printed out into halves.) ½ |
How
do you know the answer is ½? |
|
|
Because
there are 2 cookies and 4 people, so you divide the cookies into 4 pieces. |
|
|
4
cookies among 16 people |
(He
divides the cookies into fourths and counts all the pieces to make sure there
are 16.) ½
|
Why? |
Interview Task
|
Student Response
You
need 16 pieces, so the cookies should be divided into 4 pieces. |
Thoughts/Comments
I
am thinking that he understands how to get the answer, but does not know how
to put it in terms of fractions. |
|
7
cookies among 56 people |
(He
divides the cookies into eighths and counts the pieces by 1 until he gets
24.) 8 |
(Okay,
now I am sure that he is confused about how to say the answer.) You
say 8. So what fraction or portion of
the cookie does each person get? |
|
|
A
piece. |
You’re
right. They do get a piece of the
cookie, but how would you say it in terms of a fraction. |
|
|
8
(He is starting to get frustrated.) |
Now,
I realize that he may have trouble saying the answer in terms of
fractions. I do not think this is
major and decide to end for today. |
Interview Task
Flashing Student 2
·· ·· ·· ·· · |
Student Response
9 |
Thoughts/Comments
How
did you see 9? |
|
|
I
saw 4 and 5 together. |
|
|
·· ·· ·· ·· ·· ·· ·· ·· ·· · |
19 |
In
what order did you see this? |
|
|
10
and then 9 |
Did
you notice anything? |
|
|
1
was missing, making 9 |
Okay. |
·· ···· ·· ·· ·· ·· · |
14 |
How did you get 15? |
|
|
I
saw that 2 were missing, making 8 and I counted the other 6. |
I realized that he made a mistake, but I feel that he has and firm grasp on this idea. I move on to more difficult problems. |
Interview Task
Fractions-Addition Bobby
ate ½ of his candy bar on Monday and ½ of his candy bar on Tuesday. How much of the candy bar has he eaten? |
Student Response
The
whole thing. |
Thoughts/Comments
Why is it the whole thing? |
|
|
Because
if he ate ½ of it and ate the other ½ of it, he ate the whole thing. |
This
really doesn’t tell me what he knows, so I ask another question. |
|
Johnnie
at ¼ of his cookie on Friday and 2/4 of his candy on Saturday. How much of the cookie did he eat? |
3/8
|
Why
is the answer 3/8? |
|
|
I
don’t know. |
Show
me how you figured it out. |
Interview Task |
Student ResponseI
said ¼ + 2/4 = 3/8 |
Thoughts/Comments
Now,
I see that he is adding the fractions together. (numerator + denominator) |
|
Becky
gave 1/6 of her bubble gum to her little sister and gave 4/6 away to her
little brother. How much did she give
away? |
5/12 |
Why? |
|
|
Like
the others. 1/6
+ 4/6 = 5/12 |
Okay. |
|
Fractions Mike
has a can of Mt. Dew. If he drinks ½
of it, how much does he have left? |
½
|
And
you know this because? |
Interview Task |
Student Response2
halves equal a whole |
Thoughts/Comments
|
|
Melissa
raked 2/3 of the yard today. How much
does she have left to rake tomorrow? |
3/3 |
Explain. |
|
|
I
don’t know. I haven’t really learned
this. |
Okay,
let’s try another. |
|
Stephanie
wrote ¼ of her English paper on Wednesday.
How much does she have left to write? |
1/3,
no 4/4. |
Show
me how you figured this problem out. |
Interview Task |
Student Response(He
draws a number line like this ¼, 1/3, ½.) |
Thoughts/Comments
What
does this mean? |
|
|
There
are 4 spaces left so, the answer is 4/4. |
I
see that he does not understand how to subtract fractions. I ask more problems to see how he thinks. |
|
Fractions-Subtraction ½
minus ½ equals |
0 |
Why? |
|
|
The
whole thing is gone. |
|
Interview Task¾
minus ¼ |
Student Response4/8.
Oh, minus, then 2/0. |
Thoughts/Comments
He
is now subtracting the numerator and denominator. |
|
15/18
- 3/18 |
12/0
(almost confidently) |
What
method did you use? |
|
|
Subtraction |
I
conclude that he does not do well with fractions and decide to ask him some
other questions. |
|
Context Problems-Multiplication Anna
has 3 boxes of cookies. Each box has
11 cookies in it. How many cookies
does she have altogether? |
33 |
How
do you know? |
|
|
I
counted 10, 20, 30 +1 left over. |
At
first, I was confused, but I found out that he knew that there were 3 sets of
11. Instead of working with 11, he
changed everything to 10 and added the leftovers. |
|
John
has 18 boxes of marbles. Each box has
12 marbles in it. How many marbles
does he have altogether? |
(He
starts to draw lines to represent 96, then stops.) This
is basically 12 x 18. |
So
what do you think the answer is? |
|
|
(He
sets up the multiplication problem.) 96 |
|
|
|
|
|
I chose to interview an Emotionally Disabled student from
Memminger Elementary School because I was interested to see what math
strategies he or she would posses. I knew that the student might have a
difficult time focusing on tasks for a large amount of time, so I decided to
break the activity up into two days.
However, the student I was working with did not attend school on the
second day and I had to work with another student.
The first student that I
interviewed was a 9-year-old fourth grader.
He has been at Memminger for 2 years.
He lives in a single parent home with his mother, 2 sisters, and
brother. His favorite subjects are math
and spelling.
The
second student was a 13-year-old sixth grader. He has attended the school for 1 and ½ years. He lives with his older sister and 2 younger
sisters. His favorite subjects are
science and math. He hopes to attend
college and become an actor or rap artist.
By
interviewing the first student, I conclude that he uses addition to solve
multiplication word problems. (I am not
sure if he understands the connection between addition and
multiplication.) When solving the first
word problem, he counted by five.
Although he did not get the correct answer on the right try, I figured
that he knew what to do and may have been just a little nervous. He was able to recognize on his own that the
answers that he was calling out were incorrect. He also knew that he needed to count by 5 four times to get the
answer. However, I am not sure if he
realized that he could have also answered the problem by multiplying 4 and
5. In the second problem, he seemed to
use simple addition. He knew that he
should add 11 together 3 times in order to get the answer. He made the problem somewhat complex by
adding 11+11 =22 and 22+11=33 instead of adding 11+11+11. The third problem was difficult for the
student. I believe that this was a
result of the larger numbers that were posed.
When I realized this, I began to ask him questions with smaller numbers
and he was able to successfully solve them.
Division word problems
confused the student a little; however, he attempted to solve some of them
using subtraction. He answered the
first problem correctly, but his explanation was incorrect. He explained that he “counted down from 16
four times, when in actuality it should have been three. I believe he would have noticed the mistake
if he understood that the problem was division, not subtraction. The student tried to solve the second
problem using frog manipulatives because it included a large number. The answer that he gave to the problem was
incorrect, but the method that he was using was right. He knew that he must take away 5 from 54 as
many times as he possibly could. But,
since he has trouble working with large numbers, he lost track of his count
causing him to give a wrong answer. I
was totally confused by the student’s method for solving the third
problem. He tried to use pictures and
addition to solve the problem. I feel
like he was trying to solve this problem like the previous one, but somehow got
sidetracked.
The first student’s concept
of fractions is a little shaky. He
understands how to divide something up so that there are equal pieces, but he
does not understand how to put the answer in fractional terms. For example, in the second fraction problem,
he divides the cookies up correctly into 4 pieces, but says the answer is
½. Also in the third problem, he
divides the cookies into eighths, but is unable to say that the answer is
1/8. I truly feel that his concept of
fractions would be better if someone worked with him on what the divisions that
he makes actually represent.
I was told that the second
student that I interviewed may have been on a lower level than the first
student, so I decided to start off with something less difficult such as
flashing. After the flashing, I
concluded that he determined some of the answers by identifying which sections
were missing dots. If he was able to
count the missing areas, then he was able to figure out the answer. He used this method mostly when it appeared
to be an even number of missing dots. (Ex: 8).
However, when there seemed to be an uneven number of missing dots, he
simply counted all of the dots that were present.
Adding and subtracting
fractions seemed to be foreign to the student, although I was informed that the
student had a substantial amount of knowledge of them. He solved addition problems by adding the
numerators and denominators. (Ex. ¼+2/4 = 3/8)
He solved subtraction problems by subtracting the numerators and
denominators.
(Ex: ¾-2/3= 2/0)
There was no knowledge of finding a common denominator. The student did have an understanding of ½
and 1 whole. He knew that ½ + ½ =1, ½ -
½ =0, and that 1 – ½ = ½ . He also knew
how to order fractions because when he tried to solve one or two problems, his
method included writing ¼ , 1/3, and ½ in order on a number line.
When
I asked the second student multiplication word problems, I first thought that
he had little knowledge about multiplication.
I thought this because he answered the first problem by using addition. However, I soon realized that the student
understood multiplication well. In the
second problem, he began to solve the problem using addition, but realized that
he could find the answer by multiplying.
From this interview, I learned that Emotionally Disabled students have some of the same troubles with mathematics as “regular” students. They sometimes combine various math techniques and concepts that they have learned when solving problems. They also rely on manipulatives or pictures to help them solve problems that appear to be somewhat difficult or confusing. The most important thing that I learned is that Emotionally Disabled student are hardworking and focused. They take pride in being able to solve a problem correctly and seem to put forth their best effort.