addition and subtraction math strategies 1 strategy... · addition and subtraction math strategies...
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Addition and SubtractionAddition and SubtractionAddition and SubtractionAddition and SubtractionMath StrategiesMath StrategiesMath StrategiesMath Strategies
A set of 11 math posters
ByBy
Laura Zindle
Graphics from www.scrappindoodles.com
©2011 Laura Zindle
Addition Strategies included…Addition Strategies included…Addition Strategies included…Addition Strategies included…Zero StrategyZero StrategyZero StrategyZero Strategy
One More and Two More StrategyOne More and Two More StrategyOne More and Two More StrategyOne More and Two More StrategyCommutative StrategyCommutative StrategyCommutative StrategyCommutative Strategy
Sums of 10Sums of 10Sums of 10Sums of 10Doubles StrategyDoubles StrategyDoubles StrategyDoubles Strategy
Near Doubles StrategyNear Doubles StrategyNear Doubles StrategyNear Doubles StrategyMake a TenMake a TenMake a TenMake a TenTen Plus Ten Plus Ten Plus Ten Plus Ten Plus Ten Plus Ten Plus Ten Plus
SubtractionSubtractionSubtractionSubtraction Strategies included…Strategies included…Strategies included…Strategies included…Think AdditionThink AdditionThink AdditionThink Addition
Build Up Through 10Build Up Through 10Build Up Through 10Build Up Through 10Back Down Through 10Back Down Through 10Back Down Through 10Back Down Through 10
Note: Back Down Through 10 is a 2 page poster that will need to be pasted together Note: Back Down Through 10 is a 2 page poster that will need to be pasted together Note: Back Down Through 10 is a 2 page poster that will need to be pasted together Note: Back Down Through 10 is a 2 page poster that will need to be pasted together while trimming off the added border.while trimming off the added border.while trimming off the added border.while trimming off the added border.
Zero StrategyZero StrategyZero StrategyZero StrategyWhen one addend is 0
Example: 6 + 0 = 6
One More and Two More One More and Two More One More and Two More One More and Two More StrategyStrategyStrategyStrategy
Count on 1 more or 2 more
Example 5 + 2 = 7
1 2 3 4 5 6 7
Commutative StrategyCommutative StrategyCommutative StrategyCommutative StrategyThe order of the addends does not
affect the sum
Example: 7 + 3 = 10 and 3 + 7 = 10
+
= =
+
Sums of TenSums of TenSums of TenSums of TenAny two numbers that add up to ten
Example: 8 + 2 = 10
+ =
8 2 10
Doubles StrategyDoubles StrategyDoubles StrategyDoubles StrategyWhen two addends are the same
Example: 4 + 4 = 8
Add 4 More
Near Doubles StrategyNear Doubles StrategyNear Doubles StrategyNear Doubles StrategyWhen one addend is one more than the
otherExample: 5 + 5 = 10 so 5 + 6 = 11
Add 5 More
Add 1
More
Make a TenMake a TenMake a TenMake a TenMake ten by subtracting the required amount
from one addend and adding it on to the
other addend
Example: 9 + 3 can become 10 + 2
Add 1
Add 2
More
Ten PlusTen PlusTen PlusTen PlusWhen one addend is 10
Example: 10 + 4 = 14
1010
Add
More
Think AdditionThink AdditionThink AdditionThink AdditionWhen an addition fact helps solve the
subtraction fact.
Example: 5 + 5 = 10 so, 10 – 5 = 5
Think5 + 5 = 10
Think
Addition
10 – 5 = 5
Build up Through 10Build up Through 10Build up Through 10Build up Through 10This is used for subtraction facts that have a number
minus 8 or 9. Instead of subtracting, you build up
starting with the 8 or the 9. Example: 14 – 8, you need 2 more to make 10, then you need
4 more to get 14. So, 14 – 8 is 2 + 4, which is 6.
Start with 8 Add 2 More Add 4 More
Back Down Through 10Back Down Through 10Back Down Through 10Back Down Through 10This is used for facts where one of the digits is close to
the number being subtracted.
Example: 15 – 6, take away 5 to get to 10, and then one
more to get to 9
Start with 15
Take away 5
to get 10
Then 1 more
to get 9