Estimate Sums and Differences

Front

What is estimation in mathematics?

Back

Estimation is the process of finding an approximate value that is close enough to the correct answer, often used when exact calculations are not necessary.

Front

How do you round a number to the nearest hundred?

Back

To round a number to the nearest hundred, look at the tens digit. If it is 5 or greater, round up; if it is 4 or less, round down.

Tags

CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

Front

Estimate the sum of 327 and 431 by rounding to the nearest hundred.

Back

700

Front

What is the estimated sum of 56 and 79?

Back

140

Front

How do you estimate the total number of items ordered?

Back

To estimate the total, round each quantity to the nearest ten or hundred and then add the rounded numbers.

Front

Tracy ordered 325 pet toys and 165 bags of dog food. What is the best estimate of the total number of items?

Back

500

Front

How do you find the difference between two numbers using estimation?

Back

To estimate the difference, round each number to the nearest ten or hundred and then subtract the rounded numbers.

Front

Max and his dad counted 243 pumpkin seeds, while Brita and her mom counted 333. Estimate how many more seeds Brita and her mom counted.

Back

100

Front

Estimate the sum of 120 and 190 by rounding to the nearest hundred.

Back

300

Front

What is the importance of estimation in real-life applications?

Back

Estimation helps in making quick decisions, budgeting, and assessing quantities without needing precise calculations.