Compatible Numbers for Division

Compatible numbers are numbers that are easy to compute with mentally. They are often rounded numbers that make calculations simpler.

Estimating quotients helps to quickly determine an approximate answer without performing exact calculations.

To round a number to the nearest ten, look at the digit in the ones place. If it is 5 or more, round up. If it is less than 5, round down.

The estimated quotient is $$640 \, \div \, 80$$ which equals 8.

The estimated quotient is $$300 \, \div \, 50$$ which equals 6.

You should change the divisor 53 to 50.

The result is 6.

Using compatible numbers makes it easier to perform mental math and quickly estimate answers.

The nearest ten for 76 is 80.

You can check if your estimation is reasonable by comparing it to the actual division result.