Key Idea1 of 3
Doubles Plus One
If you know 4+4=8, then 4+5 is just one more: 9! Near doubles are doubles with one extra. 6+7? Think 6+6=12, plus 1 more = 13!
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Mathematics — Addition Strategies
If you know 4+4=8, then 4+5 is just one more: 9! Near doubles are doubles with one extra. 6+7? Think 6+6=12, plus 1 more = 13!