Estimate Sums Review

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 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

Estimate the sum of 471 + 529 by rounding to the nearest ten.

Back

470 + 530 = 1000.

Front

Estimate the sum of 527 + 215 by rounding to the nearest hundred.

Back

500 + 200 = 700.

Front

Estimate the sum of 78 + 47 by rounding to the nearest ten.

Back

80 + 50 = 130.

Front

Estimate the sum of 446 + 279 by rounding to the nearest hundred.

Back

400 + 300 = 700.

Front

Estimate the sum of 214 + 312 by rounding to the nearest ten.

Back

210 + 310 = 520.

Front

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

Back

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

Front

What is the difference between exact calculation and estimation?

Back

Exact calculation provides a precise answer, while estimation gives a rough approximation that is often sufficient for practical purposes.