Doubling & Halving

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24 * 25 = ?

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12 * 50 = ?

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6 * 100 = ?

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32 * 21 = ?

16 * 42 = ?

8 * 84 = ?
4 * 168 = ?

2 * 336 = ?

1 * 672 = ?

How could you halve and double this problem?

32 * 21 = ?

Ratio Tables?

Area Models?
Partial Products?
Expanded Algorithm?
Standard Algorithm?

How did you solve?

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13 * 8 = ?

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26 * 4 = ?

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52 * 2 = ?

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