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To find 4 times any number, Susan uses the Double-Double strategy (multiply by 2, then by 2 again). Susan wrote (2 x 9) x 2 to record how she would solve 4 x 9.

To find 4 times any number, Susan uses the Double-Double strategy (multiply by 2, then by 2 again). Susan wrote (2 x 9) x 2 to record how she would solve 4 x 9.
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To find 4 times any number, Susan uses the Double-Double strategy (multiply by 2,

then by 2 again). Susan wrote (2 x 9) x 2 to record how she would solve 4 x 9.

asked
User Subedi Kishor
by
8.1k points

1 Answer

1 vote

Answer:

Yes that's a valid method

Explanation:

4*9=2*2*9

4*9=36

2*2*9=2*18=36

answered
User Kousen
by
7.6k points
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