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you can do this in your head. What's 13 x 10? (HINT: anytime you're mulitplying by 10, just move the decimal place over one digit)

Then, you double it! (since 20 is double 10).

13.0 x 10 = 130

130 gets doubled and becomes 260.

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13y ago
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6y ago

260

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Q: What is 20 x 13?
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