Estimating Multiplication

Front

What is estimation in multiplication?

Back

Estimation in multiplication is a method used to find an approximate product rather than an exact answer. It helps to quickly assess the size of the product.

Front

How do you round numbers for estimation?

Back

To round numbers for estimation, 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: 3,429 x 6

Back

18,000

Front

Estimate the product: 5,678 x 4

Back

24,000

Front

Estimate the product: 6,258 x 9

Back

54,000

Front

Estimate the product: 146 x 8

Back

800

Front

Estimate the product: 78 x 2

Back

160

Front

What is the purpose of estimating products?

Back

The purpose of estimating products is to quickly determine a reasonable answer without calculating the exact product.

Front

What is a compatible number?

Back

A compatible number is a number that is easy to compute with mentally, often used in estimation.

Front

How can you use compatible numbers to estimate 3,429 x 6?

Back

You can round 3,429 to 3,400, which is a compatible number, making it easier to estimate: 3,400 x 6 = 20,400.