Rounding and Estimating Sums

Front

What is rounding in mathematics?

Back

Rounding is the process of adjusting the digits of a number to make it simpler or to make it easier to work with, typically by increasing or decreasing it to the nearest specified place value.

Front

What does it mean to estimate a sum?

Back

Estimating a sum involves calculating an approximate total by rounding the numbers involved before performing the addition.

Front

How do you round a number to the nearest ten?

Back

To round a number to the nearest ten, look at the digit in the ones place. If it is 5 or greater, round up; if it is less than 5, round down.

Front

How do you round a number to the nearest hundred?

Back

To round a number to the nearest hundred, look at the digit in the tens place. If it is 5 or greater, round up; if it is less than 5, round down.

Front

What is the estimated sum of 48 and 64 when rounded to the nearest ten?

Back

The estimated sum is $110, as 50 (rounded from 48) + 60 (rounded from 64) equals 110.

Front

What is the estimated sum of 37 and 52?

Back

The estimated sum is 90, as 40 (rounded from 37) + 50 (rounded from 52) equals 90.

Front

What is the nearest ten to the number 38?

Back

The nearest ten to 38 is 40.

Front

What is the nearest hundred to the number 87?

Back

The nearest hundred to 87 is 100.

Front

Which number rounds to 500 when rounded to the nearest hundred?

Back

The number 548 rounds to 500 when rounded to the nearest hundred.

Front

What is the purpose of rounding numbers in real-life applications?

Back

Rounding numbers helps simplify calculations, making it easier to estimate costs, distances, and other quantities in everyday situations.