Compatible Numbers in Division

Front

What are compatible numbers?

Back

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

Front

How do you estimate a division problem using compatible numbers?

Back

To estimate a division problem, round the numbers to compatible numbers that are easier to divide.

Front

Estimate 485 ÷ 92 using compatible numbers.

Back

450 ÷ 90 = 5.

Front

Estimate 122 ÷ 59 using compatible numbers.

Back

120 ÷ 60 = 2.

Front

What is a reasonable estimate for the number of classes if a school has 617 students and each class has between 28 and 32 students?

Back

20 classes.

Front

Estimate 2,740 ÷ 67 using compatible numbers.

Back

40.

Front

Estimate 7261 ÷ 83 using compatible numbers.

Back

90.

Front

Why is it useful to use compatible numbers in division?

Back

Using compatible numbers makes it easier to perform mental calculations and get a quick estimate.

Front

What is the compatible number for 92 when estimating 485 ÷ 92?

Back

90.

Front

What is the compatible number for 59 when estimating 122 ÷ 59?

Back

60.