Estimating Products

Front

What is estimating products?

Back

Estimating products involves rounding numbers to make multiplication easier and quicker, allowing for a close approximation of the actual product.

Front

How do you round numbers for estimation?

Back

To round a number, look at the digit to the right of the place value you are rounding to. If it's 5 or more, round up; if it's less than 5, round down.

Front

Estimate the product of 519 x 8 by rounding 519 to the nearest hundred.

Back

500 x 8 = 4,000.

Front

Estimate the product of 52 x 57 by rounding 52 to the nearest ten.

Back

50 x 60 = 3,000.

Front

Estimate the product of 47,825 x 2 by rounding 47,825 to the nearest thousand.

Back

48,000 x 2 = 96,000.

Front

Estimate the product of 407 x 78 by rounding 407 to the nearest hundred.

Back

400 x 80 = 32,000.

Front

Estimate the product of 5,299 x 37 by rounding 5,299 to the nearest thousand.

Back

5,000 x 40 = 200,000.

Front

What is the purpose of estimating products?

Back

The purpose is to quickly assess the size of a product without calculating the exact answer, which is useful in everyday situations.

Front

What is a compatible number?

Back

Compatible numbers are numbers that are easy to compute with mentally, often used in estimation.

Front

Give an example of compatible numbers for estimating 52 x 57.

Back

Use 50 and 60 as compatible numbers to estimate 50 x 60 = 3,000.