addition and subtraction math strategies 1 strategy... · addition and subtraction math strategies...

Addition and SubtractionAddition and SubtractionAddition and SubtractionAddition and SubtractionMath StrategiesMath StrategiesMath StrategiesMath Strategies

A set of 11 math posters

ByBy

Laura Zindle

ZinTwinL@aol.com

LauraZindle@gmail.com

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