Unit 3 Estimating Word Problems

Front

What is estimating in math?

Back

Estimating is finding a number that is close enough to the right answer, often by rounding numbers.

Front

How do you round a number to the nearest hundred?

Back

Look at the tens digit: if it's 5 or more, round up; if it's 4 or less, round down.

Front

Estimate the sum of 389 and 225 by rounding to the nearest hundred.

Back

About $600.

Front

What is the purpose of estimating in word problems?

Back

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

Front

How do you find the difference between two numbers when estimating?

Back

Round both numbers to the nearest hundred, then subtract the smaller from the larger.

Front

Estimate how much closer Lori lives to her grandparents than to her aunt.

Back

About 100 miles.

Front

What is the estimated total of 334 and 278 when rounded to the nearest hundred?

Back

About 600 cards.

Front

How many hundreds are in the sum of 547 and 284?

Back

There are 8 hundreds.

Front

What is the estimated total number of cans Mr. Narcisse has?

Back

About 800 cans.

Front

Why is it important to round numbers in word problems?

Back

Rounding makes it easier to do mental math and quickly find approximate answers.