Adding the same number to itself is called doubling numbers.
For
example: 2 + 2 = 4 is doubling the number 2.
Learning to double numbers can help you to learn addition facts. If you know 6 + 6 = 12
then you can say 6 + 7 = 12 + 1 because 7 is one more than 6.
So 6 + 7 = 13 and 6 + (6 + 1) = 13.
Find the sums of the doubled numbers.
2 + 2 =
3 + 3 =
4 + 4 =
5 + 5 =
6 + 6 =
7 + 7 =
8 + 8 =
9 + 9 =
2 + 2 + 1 =
3 + 3 + 1 =
4 + 4 + 1 =
5 + 5 + 1 =
6 + 6 + 1 =
7 + 7 + 1 =
8 + 8 + 1 =
9 + 9 + 1 =
10 + 10 + 1 =
11 + 11 + 1 =
12 + 12 + 1 =
13 + 13 + 1 =
14 + 14 + 1 =
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