Round each factor to the nearest ten, then multiply to estimate 38 x 21.

Round each addend to the nearest whole number, then add to estimate 12.7 + 8.4.

Devon says 5.1 x 3.9 = 19.89. Round each factor to the nearest whole number to check. Is his answer reasonable?

Round each number to the nearest ten, then subtract to estimate 83 - 46.

Jae says 7.8 x 3.1 is about 24. Which rounded computation gives her estimate?

Round each factor to the nearest hundred, then multiply to estimate 412 x 289.

Round each number to the nearest whole number, then subtract to estimate 15.2 - 6.8.

Round the dividend to the nearest hundred and the divisor to the nearest ten, then divide to estimate 383 divided by 21.

Ella multiplied 62 x 48 and got 2,976. Round each factor to the nearest ten to check her work. What does the estimate show?

Rounding each factor to the nearest ten, 48 x 31 is about 1,500.

Round 196 to the nearest hundred and 12 to the nearest ten, then multiply to estimate 196 x 12.

Ravi adds 4.6 + 3.8 and writes 84. Round each addend to the nearest whole number. What does the estimate show?

The digits of 3.4 x 5.2 are 1768. The estimate 3 x 5 = 15 tells you where the decimal point goes. What is the product?

Round the dividend to the nearest thousand and the divisor to the nearest ten, then divide to estimate 3,847 divided by 38.

Tom rounds 812 to 800 and 19 to 20, but says 812 divided by 19 is about 400. What mistake did he make?

The estimate 10 + 4 shows that 41.2 is a reasonable answer for 9.8 + 4.2.

A club buys 28 shirts that cost $19.75 each. Round the price to the nearest dollar and the number of shirts to the nearest ten. About what is the total?

Round each addend to the nearest tenth, then add to estimate 3.47 + 2.18.

Round each factor to the nearest whole number, then multiply to estimate 9.4 x 4.6.

Nia rounds 32 to 30 and 58 to 60 to estimate the product 32 x 58. What is her estimate?

A carton holds 24 eggs and a store has 96 cartons. A student says that is about 230 eggs. Round 96 to the nearest hundred to judge.

A farm packs 1,824 apples into bags of 19. Round the dividend to the nearest hundred and the divisor to the nearest ten. About how many bags is that?

If you round both factors up before multiplying, your estimated product is greater than the exact product.

Round each factor to the nearest ten, then multiply to estimate 74 x 89.

Kim says 0.7 x 0.6 = 4.2. Without finding the exact product, why is her answer unreasonable?

Leo multiplied 61 x 52 and got 317. Round each factor to the nearest ten to check. What does the estimate show?

Round each number to the nearest whole number, then divide to estimate 35.8 divided by 5.9.

The estimate 400 divided by 20 shows that 200 is a reasonable answer for 412 divided by 19.

Round each number to the nearest ten, then add to estimate 268 + 341.

Round each number to the nearest hundred, then add to estimate 486 + 237.

Which estimate of 6.8 x 4.9 comes closest to the exact product?

You estimate 47 x 82 as 50 x 80 = 4,000. How does your estimate compare with the exact product?

You estimate 44 x 68 as 40 x 70 = 2,800. How does your estimate compare with the exact product?

A theater has 48 rows with 32 seats in each row. A student says it seats about 150 people. Round each factor to the nearest ten to judge.

Which number sentence estimates 396 + 512 by rounding each number to the nearest hundred?

The digits of the quotient 9.66 divided by 2.1 are 46. The estimate 10 divided by 2 = 5 tells you where the decimal point goes. What is the quotient?

Round each addend to the nearest tenth, then add to estimate 0.45 + 0.62.

Ben divides 18.6 by 3 and gets 62. Use the estimate 18 divided by 3 to check his answer. What does the estimate show?

Estimating a product helps you check whether the decimal point is in the right place in your answer.

What is the main reason to estimate 48 x 63 before you multiply?