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A simple trick with multiplying decimal numbers is to remove the decimals, multiply the two numbers, then add the decimals back in. The number of decimals you add back in is the total number of decimal places.

For example, the stated problem has 1 decimal places in 2.1 and 2 decimal places in 5.01. So first we do the following:

21x501=10521

Now we add 1+2=3 decimal places into the result above:

10.521

That's the answer.

Q: I need help with decimals 2.1 x 5.01?

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8 hours and 21 minutes

44.5238

21/3 = 2.33... recurring.

The LCM applies to integers, not decimals.

592 divided by 28 is 21 full containers. (21 is rounded to the nearest whole number, it had decimals.)

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44.5238

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21/3 = 2.33... recurring.

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chapter 21

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There are infinitely many numbers. For example, 21.456542700000000000001 21.456542700000000000000005 21.456542700000000002