Elementary Math 3 Near Doubles/Doubles + 1

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Tim Bottman's picture

Near doubles are also called the “doubles-plus-one” facts and include all combinations where one addend is one more than the other. There are 18 of these facts. When students realize that these are facts that have addends with a difference of 1 (1 + 2), (3+ 4), (5 + 6) etc. they simply double the smaller addend and add 1.

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Right: #
Wrong: #
# Right & # Wrong of #

1+2

1+2 = 3

2+3

2+3 = 5

3+4

3+4 = 7

4+5

4+5 = 9

5+6

5+6 = 11

7+8

7+8 = 15

8+9

8+9 = 17

2+1

2+1 = 3

3+2

3+2 = 5

4+3

4+3 = 7

5+4

5+4 = 9

6+5

6+5 = 11

8+7

8+7 = 15

9+8

9+8 = 17