Key Idea1 of 3
Multiplying by 1 and 2
Any number times 1 stays the same: 1x7=7, 1x3=3. Multiplying by 2 is the same as doubling: 2x3=6, 2x5=10, 2x4=8. If you can double a number, you can multiply by 2!
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Mathematics — Multiplication War
Any number times 1 stays the same: 1x7=7, 1x3=3. Multiplying by 2 is the same as doubling: 2x3=6, 2x5=10, 2x4=8. If you can double a number, you can multiply by 2!