Addition Chart 25 The Sum Of 15. Page 3
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1
2
3
430
Doubling Numbers 27
It is very useful to know these doubled
numbers by heart
+
1
2
3
4
5
6
7
8
9
1
2
4
3
4
5
6
7
8
9
•
As you can see from the chart, double two
•
It is just as easy to work out that 7 + 6 = 13
equals 4. Fill in all the doubles.
because 6 is one less than 7.
•
If you know that 7 + 7 = 14, it is easy to
work out that 7 + 8 = 15 because 8 is one
more than 7.
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