Word Problems
Emily has 67 days to develop a part for an airplane. She has already worked 29 days. How many days does she have left to develop the part?
38 days
The answer to a subtraction problem is called the ______.
difference
Milly decomposes 47 to subtract 92-47. Which shows one way to decompose 47?
A. 4 and 7 C. 40 and 7
B. 50 and 3 D. 70 and 4
C
Which subtraction equation do these base-ten blocks show?
55-23=?
Create the related facts for the numbers 6, 7, and 13.
6+7=13
7+6=13
13-6=7
13-7=6
Levi can play 47 songs on the piano. 19 of the songs are jazz. The rest of the songs are classical. How many classical songs can Levi play?
28 classical songs
You can ______ 1 ten into 10 ones to help you subtract.
Regroup
How could you use a number line to subtract?
83-21=______
62
Use a base-ten model to solve:
94-57=?
37
Write a related addition equation that could be used to solve for the difference.
71-56=?
56+?=71
?+56=71
There are 73 people sitting in booths at a restaurant. There are 48 fewer people sitting at tables than in booths. How many people are sitting at tables?
25 people are at tables
One way to subtract using a number line is to _________________.
count back
Decompose to solve using equations.
63-45=______
63-40=23
23-5=18
Use base-ten shorthand to solve for the difference.
56-27=
29
Match the subtraction equation to the addition equation that an be used to find the difference.
a. 46-19=? 1. 23+?=64
b. 64-23=? 2. ?+19=64
c. 46-23=? 3. 19+?=46
d. 64-19=? 4. ?+23=46
a3
b1
c4
d2
There are 72 people waiting in line to ride the roller coaster. When the ride stops, 16 people get on the roller coaster. Then 24 people exit the line. How many people are waiting in line now?
A. 32 people C. 64 people
B. 80 people D. 112 people
A
When you _______ numbers, you break them into different parts.
decompose
Use decomposing and a number line to solve for the difference.
86-49=____
37
What subtraction equation does this base-ten model represent?
40-26=14
Use addition to solve this subtraction equation:
47-38
38+9=47
9+38=47
Carlos has 35 round buttons, 12 square buttons, and some triangle buttons. Carlos has 61 buttons in all. How many triangle buttons does Carlos have?
14 triangle buttons
The_____ of a digit tells you weather the digit represents a number of tens or ones in a number.
place value
Juan solves 84-37 by decomposing 37 into 3 and 7. How would you respond to Juan? Explain your thinking.
Juan is incorrect. If he decomposes by place value, he should decompose 37 into 30 and 7 because the digit 3 represents 3 tens not 3 ones.
Jennifer created this base-ten model to subtract 63-29. Jennifer says the answer is 34. Did Jennifer use the strategy correctly? Explain your thinking.
Yes, Jennifer is correct. She had to regroup a ten to subtract the ones. This gave her 5 tens and 13 ones. She subtracted 9 ones and was left with 4 ones. She then subtracted 2 tens leaving 3 tens. 3 tens and 4 ones equals 34.
Dottie says she can use addition to solve subtraction equations and subtraction to solve addition equations. Do you agree or disagree with Dottie? Explain.
Dottie is correct. Since addition and subtraction are related to each other, you can use the opposite operation to solve each kind of equations.