Because some decimals are really long and hard to write down. Especially if they're not repeating ones. So people round them to be able to say them or write them.
In the same way as you estimate them for whole numbers.
to find a low estimate for the product of two decimals, round both factors
Decimals are estimated by rounding off the decimal places to the nearest tenths,hundredths,thousandths,ten thousandths,etc.
They are not, so the question is misguided. Decimals are good for some purposes, percentages for others.They are not, so the question is misguided. Decimals are good for some purposes, percentages for others.They are not, so the question is misguided. Decimals are good for some purposes, percentages for others.They are not, so the question is misguided. Decimals are good for some purposes, percentages for others.
I think you round it to the nearest whole number...
1.0 and 0.5
7.8+31.39+6.95
32.1 does is good enough.
You divide decimals like you normally would divide two numbers. Just make sure your decimals get in the right spot and your good! :)
0.235 * 0.6891 = 0.1619385 What's to estimate? The total decimal places in the multiplicands is the total in the answer.
Using an estimate ensures that the answer is about right. With decimals where the decimal point should go is difficult for a lot of people, so an estimate of the answer ensures that it is put in the right place.
To check if you have divided two decimals correctly, you can multiply the quotient by the divisor. If the product equals the original dividend, then your division is accurate. Additionally, you can estimate the division by rounding the decimals to whole numbers, performing the division with the rounded values, and comparing the result to your original quotient for consistency.