Subtraction
Addition Patterns
Vocabulary
Estimate by Rounding
Addition
100

6 - 3 

3

100
1 more than 75
What is 76?
100
Doing math in your head.
What is mental math?
100
Estimate by rounding to the nearest 10. 75 + 12
What is 90?
100
192 + 464
What is 656?
200

18 - 7

11

200
2,343; 3,343; 4,343; 5,343 Pattern: Adding ____
What is 1,000?
200
This tells you which operations to group in a number sentence.
What are parentheses?
200
Round to the greatest place. 634 + 788
What is 1,400?
200
387 + 251
What is 638?
300

13 - 5 

8

300
495, 505, 515, ___, ___, 545 Pattern: Adding ____
What is 525, 535, and 10's?
300
A number close to its actual value
What is an estimate?
300
Estimate by rounding to the nearest hundred to find the sum. 305 + 853
What is 1,200?
300
834 + 486
What is 1320?
400

56-29

27

400
10 more than 723 100 more than 723 1,000 more than 723
What is 733, 823, 1,723?
400
The missing number or what you are solving for in a problem
What is the unknown?
400
Estimate by rounding to the nearest 100 to find the sum. 632 + 583
What is 1,200?
400
6,345 + 2,956
What is 9301?
500

124-51

73

500
1,000 more than 9,876 100 more than 9,876 10 more than 9,876 1 more than 9,876
What is 10,876; 9,976; 9,886; 9,877?
500
To use place value to exchange equal amounts when renaming a number.
What is regrouping (to regroup)?
500
Estimate by rounding to the nearest ten to find the sum. 578 + 409
What is 990?
500
7,895 + 3,647
What is 11,542?
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