Worksheet: Addition and Subtraction Strategies (Within 100)

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Think of subtraction as finding the difference between 2 numbers. As long as they both increase by the same amount, the difference will always remain the same.

For example, if you work for 32 hours and your friend works 28 hours, the difference is 4 hours. If you then both work an another 12 hours, the difference is still 4 hours.

Use this idea to make the subtractions below easier. Add to the bottom number to make a multiple of 10 and then add that same number to the top number before doing the subtraction. The first one is done for you.

83	+2	85
- 38	+2	- 40
		45

93	+2	95
- 58	+2	- 60
		35

85	+3	88
- 47	+3	- 50
		38

72	+4	76
- 46	+4	- 50
		26

64	+2	66
- 58	+2	- 60
		6

56	+3	59
- 37	+3	- 40
		19

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42	+5		47
- 25	+5	=	- 30
			17

97	+2		99
- 68	+2	=	- 70
			29

83	+3	86
- 47	+3	- 50
		36

75	+4	79
- 56	+4	- 60
		19

67	+2	69
- 38	+2	- 40
		29

57	+1	58
- 29	+1	- 30
		28

44	+2	46
- 28	+2	- 30
		16

91	+5	96
- 75	+5	- 80
		16

--------- Page Break-------------

84	+3		87
- 67	+3	=	- 70
			17

72	+4		76
- 36	+4	=	- 40
			36

62	+2	64
- 28	+2	- 30
		34

56	+3	59
- 37	+3	- 40
		19

92	+1	93
- 19	+1	- 20
		73

62	+5	67
- 25	+5	- 30
		37

41	+3	44
- 17	+3	- 20
		24

83	+1	84
- 49	+1	- 50
		34

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Related Resources

The various resources listed below are aligned to the same standard, (2NBT05) taken from the CCSM (Common Core Standards For Mathematics) as the Addition and subtractionWorksheet shown above.

Fluently add and subtract within 100 using strategies based on place value, properties ...

Flashcards

Games

Lessons

Adding two 2-digit numbers

Worksheets

Bridging Multiples of 10 e.g. 17 + 5, 78 + 7
Number Bonds To 100 (with blank number lines)
2-digit & 1-digit - no regrouping e.g. 34 + 5, 56 - 4
2-digit numbers - no regrouping e.g. 42 + 36, 34 + 12
2-digit numbers - regrouping e.g. 47 + 16, 78 - 29
2-digit - 1-digit - no regrouping e.g. 68 - 5
2-digit - 1-digit - regrouping e.g. 65 - 7
2-digit - 2 -digit - no regrouping e.g. 86 - 43
2-digit - 2-digit - regrouping e.g. 57 - 39
2-digit + 1-digit - no regrouping e.g. 34 + 5
2-digit + 2 -digit - no regrouping e.g. 42 + 36
2-digit + 2-digit - regrouping e.g. 47 + 16

Number bonds

Number bonds to 20 e.g.8 + ___ = 20
Number bonds to 30 e.g.26 + ___ = 30
Number bonds to 40 e.g.12 + ___ = 40
Number bonds to 50 e.g.17 + ___ = 50
Number bonds to 100 e.g. 43 + ___ = 100

Similar to the above listing, the resources below are aligned to related standards in the Common Core For Mathematics that together support the following learning outcome:

Use place value understanding and properties of operations to add and subtract

Addition and Subtraction: 1 of 3 (within 1000) (From Worksheets)
Addition and Subtraction: 2 of 3 (within 1000) (From Worksheets)
Addition and Subtraction: 3 of 3 (within 1000) (From Worksheets)
Three 1-digit numbers e.g. 3 + 4 + 8 (From Worksheets)
Three 2-digit numbers e.g. 35 + 14 + 26 (From Worksheets)
Four 1-digit numbers e.g. 3 + 4 + 8 + 2 (From Worksheets)