Addition
Subtraction
Vocabulary
Word Problems
Diagrams/Tricky Problems
100
Find the number that makes the equation true:
65+34=_______
99
100
Find the number that makes the equation true:
35-8=_______
27
100
What does "value" mean in math?
The answer
100
There are 18 kids playing on the playground with the swings at recess. 23 more kids come to join them. How many kids are on the playground with the swings?
41 kids
100
Mrs. K drew this diagram to find the value of 46-27. Explain Mrs. K's strategy and what she did to find the answer.
Mrs. K used a Base-10 strategy. She drew 46 in tens and ones and then crossed out 2 tens. She had to decompose a ten and then was able to cross out 7 ones to get her answer of 19.
200
Find the value of the sum:
36+21=_______
57
200
Find the difference below:
78-22=_______
56
200
What does the term "difference" mean in math?
The answer to a subtraction problem.
200
Tom spent 32 minutes playing Prodigy on Tuesday. Then on Wednesday, he played Prodigy for another 55 minutes. How many more minutes did Tom play Prodigy for on Wednesday than on Tuesday?
23 more minutes.
200
What is true about this image?
a. It shows 34-19.
b. It shows 34 + 19.
c. It shows a ten being decomposed into ones.
d. Mrs. K is bad at drawing on her laptop.
a, c, d
300
Find the value of the sum:
37+28=______
65
300
Find the number that makes the equation true:
68-45=_____
23
300
What does the term "sum" mean in math?
The answer to an addition problem.
300
Bella is helping Mrs. K organize the pencils in her classroom. Bella finds 41 yellow pencils and 29 blue pencils. She throws away 12 that are too short.
How many pencils are left in all?
58 pencils are left.
300
Here is Richie's work to find the value of 75-34:
75-30=45
45-2=43
43-2=41
Why does Richie's strategy work?
Richie's strategy works because he broke 34 up into 30+2+2 and subtracted a bit at a time.
400
Find the number that makes the equation true:
75+____=89
14
400
Find the difference below:
77-28=_______
49
400
What is an equation?
A number sentence.
400
There are 34 kids and 12 adults in the cafeteria. 22 more kids come into the cafeteria for lunch. How many people are the cafeteria now?
68 people in all.
400
Which expressions have the same value as 23+21:
a. 23+ 20 + 1
b. 23+ 20 + 0
c. 17 + 6 + 21
d. 15 + 10 + 2
a, c
500
Find the number that makes the equation true:
51+____=80
29
500
Find the number that makes the equation true:
45-_____=31
14
500
What do "decompose a ten" and "regroup" mean?
Decompose a ten- to break down a ten into 10 ones.
regroup- to group 10 ones as a ten in the tens place.
500
Arusha put 15 stickers on her notebook on Monday. On Tuesday, she put in 36 stamps. If Arusha's notebook can only hold 90 stickers, how many more can she put on?
She can only put 39 more stickers on her notebook.
500
To find the sum of 12 + 27, Anna added the ones and got 9. Then she added the tens and got 3. Last, she added the ones and the tens and got 12.
Is Anna right? Do you agree with her strategy? Why or why not?
No, Anna is not right because you cannot add the ones and the tens together as single digits. The 3 in the tens is really 30, so she should have added 30 + 9 which is 39.