Chapter 4-2 "Round to Estimate Products"

Front

What does it mean to estimate?

Back

To round a number to make it easier to work with.

Front

How do you estimate the product of two numbers?

Back

Round each number to a nearby value that is easier to multiply.

Front

Estimate the product of 34 and 9 by rounding 34 to the nearest ten.

Back

30 x 10 = 300.

Front

If you have 81 bags with 5 cans each, how do you estimate the total number of cans?

Back

Round 81 to 80, then calculate 80 x 5.

Front

What is the estimated cost of 4 plane tickets if each ticket costs $560?

Back

Round $560 to $600, then calculate 600 x 4.

Front

Estimate the product of 395 and 4 by rounding 395 to the nearest hundred.

Back

400 x 4 = 1600.

Front

What is the estimated total if a teacher has 34 students and each completes 9 problems?

Back

Estimate by rounding 34 to 30 and 9 to 10, then calculate 30 x 10 = 300.

Front

Why is estimating useful in math?

Back

It helps to quickly find an approximate answer without exact calculations.

Front

What is the estimated product of 70 and 6?

Back

70 x 6 = 420.

Front

If you want to estimate 48 x 3, what would you round 48 to?

Back

Round 48 to 50, then calculate 50 x 3 = 150.