mckinley2006
mckinley2006
11.03.2021 • 
Mathematics

Rashi used the addition table to add doubles. She colored the sums of doubles in green.
What pattern do you see?
The sums of doubles
are odd.
The
sums of doubles
are even.
+ 1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8 9 10
2 3 4 5 6 7 8 9 10 11
3 4 5 6 7 8 9 10 11 12
4 5 6 7 8 9 10 11 12 13
5 6 7 8 9 10 11 12 13 14
6 7 8 9 10 11 12 13 14 15
7 8 9 10 11 12 13 14 15 16
8 9 10 11 12 13 14 15 16 17
9 10 11 12 13 14 15 16 17 18
The sums of doubles
are both odd and even.

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