Estimating Quotients with Compatible Numbers

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 quotient using compatible numbers?

Back

To estimate a quotient, round the dividend and divisor to compatible numbers that are easy to divide.

Front

Estimate the quotient: 2,460 ÷ 8 using compatible numbers.

Back

2,400 ÷ 8 = 300.

Front

Estimate the quotient: 815 ÷ 9 using compatible numbers.

Back

810 ÷ 9 = 90.

Front

Estimate the quotient: 3,561 ÷ 7 using compatible numbers.

Back

3,500 ÷ 7 = 500.

Front

Estimate the quotient: 1,325 ÷ 3 using compatible numbers.

Back

1,200 ÷ 3 = 400.

Front

Estimate the quotient: 357 ÷ 5 using compatible numbers.

Back

350 ÷ 5 = 70.

Front

What is the purpose of estimating quotients?

Back

Estimating quotients helps to quickly assess the reasonableness of an answer without performing exact calculations.

Front

When should you use compatible numbers for estimation?

Back

Use compatible numbers when you need a quick estimate or when exact calculations are not necessary.

Front

What is a common compatible number for 8?

Back

A common compatible number for 8 is 0, 8, 16, 24, 32, etc.