Estimating multiplication

Front

What is estimating multiplication?

Back

Estimating multiplication is the process of finding a close approximation of the product of two numbers without calculating the exact answer.

Front

How do you estimate the product of two numbers?

Back

Round each number to a nearby easy-to-multiply number, then multiply those rounded numbers.

Front

What is the estimated answer of 456 x 7?

Back

3,500

Front

What is the estimated answer of 99 x 4?

Back

400

Front

What is the estimated answer of 58 x 61?

Back

3,600

Front

How do you round 456 to estimate multiplication?

Back

Round 456 to 500.

Front

How do you round 99 to estimate multiplication?

Back

Round 99 to 100.

Front

What is the estimated total of 79 injections sent to 21 hospitals?

Back

80 x 20 = 1,600

Front

Do single digit numbers get rounded?

Back

No, they don't.

Front

What is the estimated answer of 23 x 5?

Back

100