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1. When adding, the decimals MUST line up:

012.3

+32.1

2. When multiplying, you dont have to put the decimals side by side:

12.3

x323.55

Then you count how many numbers are after the decimals, which, in this case, is three.

Hope it helped!

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15y ago
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Q: What are some of the rules to follow with decimals?
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