Addition and Subtraction Links. . .
Give them a "BUZZ!"
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Add/Sub
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Strategy
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Description
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Examples
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+
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Counting on
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Adding 1, 2, or 3 to a number - use the touch points
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4+1=5, 4+2=6, 4+3=7 |
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+
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Adding 0
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Any number added to 0 will equal the first number
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5+0=5, 6+0=6
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+
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Doubles
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A number added to itself
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1+1=2, 2+2=4, 3+3=6
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+
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Doubles + 1
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A number added to itself + 1 more
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2+2=4 so 2+3=5
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+
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Turn Arounds
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The addends get switched, the sum remains the same
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2+3=5 and 3+2=5
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-
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Counting Back
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Count back 1, 2, or 3 from the number - use touch points
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5-1=4, 5-2=3, 5-3=2
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-
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Subtract all or 0 |
Take zero or the number away from itself
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7-7=0, 7-0=7
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-
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Counting Up
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Use when numbers are close to each other
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7-5= 2 (Count up from 5, 2 hops = 2) |
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+,-
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Fact Families
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The subtraction facts are related to the addition facts
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2+3=5 so 5-3=2
3+2=5 so 5-2=3 |
