Mrs. Dennison's Second Grade August Facts
Learn the 0 Facts, 1 Facts, Doubles, and Fast 9's
Remember: Learn = Instant Answer
Facts With 0
Add 0 to another number and that number is the answer. 0 doesn't change anything.
Subtract 0 from a number and the answer is that number. 0 doesn't change anything.
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10 + 0 = 10 10 - 0 = 10 |
11 + 0 = 11 11 - 0 = 11 |
12 + 0 = 12 12 - 0 = 12 |
13 + 0 = 13 13 - 0 = 13 |
14 + 0 = 14 14 - 0 = 14 |
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15 + 0 = 15 15 - 0 = 15 |
16 + 0 = 16 16 - 0 = 16 |
17 + 0 = 17 17 - 0 = 17 |
18 + 0 = 18 18 - 0 = 18 |
19 + 0 = 19 19 - 0 = 19 |
Facts With 1
Add 1 to a number and the answer increases by 1. Count on 1.
Subtract 1 from a number and the answer decreases by 1. Count
back 1.
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10 + 1 = 11 10 - 1 = 9 |
11 + 1 = 12 11 - 1 = 10 |
12 + 1 = 13 12 - 1 = 11 |
13 + 1 = 14 13 - 1 = 12 |
14 + 1 = 15 14 - 1 = 13 |
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15 + 1 = 16 15 - 1 = 14 |
16 + 1 = 17 16 - 1 = 15 |
17 + 1 = 18 17 - 1 = 16 |
18 + 1 = 19 18 - 1 = 17 |
19 + 1 = 20 19 - 1 = 18 |
Facts With Doubles
Think of 5 fingers on each hand. 5 + 5 = 10
Think of an egg carton with 6 holes on each side. 6 + 6 = 12
Think of a calendar with 7 days in each week. 7 + 7 = 14.
Think of a box of 16 crayons with 8 crayons in each row. 8 + 8 = 16
Think of a dice with 9 dots. 9 + 9 + 18
Think hands and toes. 10 + 10 = 20
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5 + 5 = 10 10 - 5 = 5
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6 + 6 = 12 12 - 6 = 6
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7 + 7 = 14 14 - 7 = 7
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8 + 8 = 16 16 - 8 = 8
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9 + 9 = 18 18 - 9 = 9
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10 + 10 = 20 20 - 10 = 10
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Nine's Trick
Addition - When you add a number to 9, picture 9 counters in a ten frame. Take one from the other number to put with nine to fill up the ten frame and make 10. So your answer is 10 + the other number - 1. We know that 9 + 6 = 15. Take 1 away from 6 and the 9 becomes 10. Now you are adding 10 + 5 (the original 6 - 1 used to fill the 10 frame).
Subtraction - If the sum of the digits in the larger number (minuend) = the number being subtracted (subtrahend), the answer is 9. If you are subtracting 9 from a number between 10 and 19, the answer is the sum of the digits of the larger number in the problem.
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9 + 2 = 11 2 + 9 = 11 11 - 2 = 9 11 - 9 = 2 |
9 + 3 = 12 3 + 9 = 12 12 - 3 = 9 12 - 9 = 3 |
9 + 4 = 13 4 + 9 = 13 13 - 4 = 9 13 - 9 = 4
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9 + 5 = 14 5 + 9 = 14 14 - 5 = 9 14 - 9 = 5 |
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9 + 6 = 15 6 + 9 = 15 15 - 6 = 9 15 - 9 = 6
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9 + 7 = 16 7 + 9 = 16 16 - 7 = 9 16 - 9 = 7 |
9 + 8 = 17 8 + 9 = 17 17 - 8 = 9 17 - 9 = 8 |
Have fun practicing your math facts with this resource created by second grade teacher Lanise Jacoby.
Math Counts-Math Web Pages