Vocabulary
Addition
Subtraction
Regroup
Challenge
100
In the number 49, 9 is in the ______ place.
Ones
100
4 tens + 2 tens = ________
40 + 20 = ________
4 tens + 2 tens = 6 tens
40 + 20 = 60
100
8 tens - 4 tens = ______
80 - 40 = ______
8 tens - 4 tens = 4 tens
80 - 40 = 40
100
17 + 4 = _____
Use tens and ones to model. Circle the ones to show regrouping.
17 + 4 = 21
*check tens and ones model
100
Use related facts to solve.
50 + ____ = 70
70 - 50 = _____
50 + 20 = 70
70 - 50 = 20
200
In the number 83, 8 is in the ______ place.
Tens
200
5 tens + 3 tens = ________
50 + 30 = ________
5 tens + 3 tens = 8 tens
50 + 30 = 80
200
9 tens - 3 tens = ______
90 - 30 = ______
9 tens - 3 tens = 6 tens
90 - 30 = 60
200
25 + 8 = _____
Use tens and ones to model. Circle the ones to show regrouping.
25 + 8 = 33
*check tens and ones model
200
There are 30 children in line to play on the swings. 20 children get to play by the end of recess. How many students did not get to play on the swings?
*Use a number line to solve
30 - 20 = 10
*check number line
300
You ________ to find the difference.
Subtract
300
Use tens and ones to model. Solve.
53 + 4 = ________
+
53 + 4 = 57
300
7 tens - 3 tens = ______
_____ - _____ = ______
7 tens - 3 tens = 4 tens
70 - 30 = 40
300
47 + 5 = _____
Use tens and ones to model. Circle the ones to show regrouping.
47 + 5 = 52
*check tens and ones model
300
Write a related addition fact.
90 - 50 = _______
_____ + _____ = _____
90 - 50 = 40
40 + 50 = 90
or
50 + 40 = 90
400
You ________ to find the sum.
Add
400
Add.
tens ones
3 5
+ 3
_________________
tens ones
3 5
+ 3
_________________
3 8
400
Subtract.
tens ones
4 9
- 3
_________________
tens ones
4 9
- 3
_________________
4 6
400
There are 16 students playing soccer. 6 more students join them in the game. How many students are playing soccer total in all?
16 + 6 = 22
*check for 4 steps
400
There are 64 students eating lunch. 5 more students join them for lunch. How many students are eating lunch in all?
64 + 5 = 69
*check for 4 steps
500
Two Parts:
The answer to an addition problem is called the ________.
The answer to a subtraction problem is called the _________.
Addition = Sum
Subtraction = Difference
500
There are 62 students going on a trip to the park. There are also 5 adults going with the students on the trip. What is the total number of people going on the trip?
62 + 5 = 67
67 people in total
500
Use a number line to solve.
There are 50 bubbles in the air. 20 of the bubbles pop. How many bubbles are still in the air?
50 - 20 = 30
500
Sean has 15 video games. He is given 9 more video games. How many video games does he have in all?
15 + 9 = 24
*check for 4 steps
500
A store has 80 pets for sell. 50 of the pets get sold. How many pets are still left at the store? Write the related addition fact.
_______ - _______ = _______
_______ + _______ = _______
80 - 50 = 30
30 + 50 = 80
50 + 30 = 80