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Addition Strategies
Zero Addition: When you add zero to a number, the number stays the same.
Example: 7+0=7 (the number stays the same)
Example: 352+0=352 (the number stays the same)
Counting On: When you are adding 1, 2, or 3, take the larger number and count on from there.
Example: 9+2=11 (think 9....count on 2 more, 10, 11)
Example: 5+3=8 (think 5...count on 3 more, 6, 7, 8)
Doubles: When the numbers that you're adding are the same, remember to double it and think of a doubles picture.
Examples: 1+1=2 2+2=4 3+3= 6 4+4=8 5+5=10 6+6=12 7+7=14 8+8= 16 9+9=18 10+10=20
Friendly Ten/Ten Partners: There are 6 pairs of numbers that go together to make 10.
0+10=10 1+9=10 2+8=10 3+7=10 4+6=!0 5+5=10
and the turnarounds:
Doubles Plus 1: When numbers are 1 apart on the number line, double it and add one.
Example: 4+5= (think 4+4=8 plus 1 more =9)
Subtraction Strategies
Zero Subtraction: When you are subtracting zero from a number, the number stays the same.
Example: 12-0=12 (the number stays the same)
A Number Minus Itself: When the number you're subtracting is the same as the number you have, the answer is always zero.
Example: 8-8=0 (the answer is always zero)
Doubles Subtraction: When you subtract half of a number. Think of the doubles picture.
Friendly 10 Subtraction: When you subtract from the number ten, think of it's ten partner.
10-10=0 10-9=1 10-8=2 10-7=3 10-6=4 10-5=5 10-4=6 10-3=7 10-2=8 10-1=9 10-0=10
Problem Solving
Math Problem Solving: 3 Steps
Write a number sentence.
Draw a picture.
What strategy did you use?
A Great math website! Mathfactscafe.com
Zero Addition: When you add zero to a number, the number stays the same.
Example: 7+0=7 (the number stays the same)
Example: 352+0=352 (the number stays the same)
Counting On: When you are adding 1, 2, or 3, take the larger number and count on from there.
Example: 9+2=11 (think 9....count on 2 more, 10, 11)
Example: 5+3=8 (think 5...count on 3 more, 6, 7, 8)
Doubles: When the numbers that you're adding are the same, remember to double it and think of a doubles picture.
Examples: 1+1=2 2+2=4 3+3= 6 4+4=8 5+5=10 6+6=12 7+7=14 8+8= 16 9+9=18 10+10=20
Friendly Ten/Ten Partners: There are 6 pairs of numbers that go together to make 10.
0+10=10 1+9=10 2+8=10 3+7=10 4+6=!0 5+5=10
and the turnarounds:
Doubles Plus 1: When numbers are 1 apart on the number line, double it and add one.
Example: 4+5= (think 4+4=8 plus 1 more =9)
Subtraction Strategies
Zero Subtraction: When you are subtracting zero from a number, the number stays the same.
Example: 12-0=12 (the number stays the same)
A Number Minus Itself: When the number you're subtracting is the same as the number you have, the answer is always zero.
Example: 8-8=0 (the answer is always zero)
Doubles Subtraction: When you subtract half of a number. Think of the doubles picture.
Friendly 10 Subtraction: When you subtract from the number ten, think of it's ten partner.
10-10=0 10-9=1 10-8=2 10-7=3 10-6=4 10-5=5 10-4=6 10-3=7 10-2=8 10-1=9 10-0=10
Problem Solving
Math Problem Solving: 3 Steps
Write a number sentence.
Draw a picture.
What strategy did you use?
A Great math website! Mathfactscafe.com