Q: What makes up a decimal?

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Lining the numbers up makes it easier to spot 0s between the decimal point and the leading non-zero digit.

No, it makes no difference.

The importance of lining up the decimals is so you can just add from bottom to top it makes things a lot easier.

When adding decimal numbers, the decimal points should be lined-up.

You will get a recurring decimal in which the recurring pattern will show up after the terminating decimal has come to an end.

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Your 4.875 rounded off is 4.9 to one decimal. When rounding off to one decimal, we look at the second decimal. When the second decimal is 5 or more, we round the first decimal up by one. In this case, the second decimal is 7, and that means we round the first decimal, the 8, up by one, and that makes it 9. That's where the 4.9 came from.

Lining the numbers up makes it easier to spot 0s between the decimal point and the leading non-zero digit.

No, it makes no difference.

1000.0 because you round the .5 up and it makes the 999 go up to 1000 so you would get 1000.0

Because 42.0+7.8 is different from adding 42+78. it makes adding easier!

0.15

The importance of lining up the decimals is so you can just add from bottom to top it makes things a lot easier.

it is used for representing decimal numbers in which each decimal digit is represented by a sequence of binary digits. This makes it relatively easy to convert the numeric representation for printing or display purposes, and speeds up decimal calculations.

All its digits are decimal digits so the question makes no sense.

When adding decimal numbers, the decimal points should be lined-up.

Approx 247.1 decimals.

comma, the line makes it longer