17.2×12.80=

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1 Answer

The answer is 220.160. Layout the working as long multiplication and ignore the decimal point for the moment.

1280

X 172

....2560

..8960

1280   

220160

Now, count how many digits there are altogether after the decimal point in the multipliers. There are three in total so the decimal point goes in front of the last three digits of the answer: 220.160.

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