Math Topic 8 Review

Front

What is estimation in math?

Back

Estimation is a way to find a number that is close enough to the right answer, often used to make calculations easier.

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 difference of 765 - 333. Which equation is reasonable?

Back

770 - 330 = 440.

Front

Estimate the sum of 405 and 385 by rounding to the nearest hundred. What is the equation?

Back

400 + 400 = 800.

Front

What is mental math?

Back

Mental math is doing calculations in your head without using paper or a calculator.

Front

How do you round a number to the nearest ten?

Back

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

Front

What is the result of 634 - 528?

Back

106.

Front

What is the nearest ten to 239?

Back

240.

Front

What is the nearest hundred to 668?

Back

700.

Front

What is the purpose of rounding numbers?

Back

Rounding makes numbers easier to work with, especially for estimation.