Estimate Products Using Rounding

What is the FIRST step in estimating products?

• Multiply the rounded numbers.

• Round off the factors to the highest place value.

• Count the number of zero.

• Divide the rounded numbers.

TRUE or FALSE: When you round off 9 993 to its highest place value, the answer is 9 000.

• False. The correct answer is 10 000.

• True

• False. The correct answer is 9 900.

• False. The correct answer is 100 000.

Check if the solution and answer below are correct.

• The solution and answer are correct.

• The solution and answer are incorrect.

• The solution is correct, but the answer should be 160 000.

What is the estimated product for the expression 87 x 403?

• 36 000

• 35 601

• 32 000

• 35 701

What is the estimated product for the expression 302 X 20?

• 804

• 7 000

• 600

• 6 000

Which is the best estimate of the product of 793 and 48?

• 800 x 40 = 32 000

• 700 x 40 = 28 000

• 800 x 50 = 40 000

• 700 x 50 = 35 000

During a recent book sale week, 1 897 titles of books were sold each day. About how many books were sold in 10 days?

• About 3 000 books.

• About 1 000 books.

• About 10 000 books.

• About 20 000 books.

Jim has Php 5 000. He wants to buy 3 model of planes at Php 1 978 each. Does he have enough money to pay for them?

• Not enough.

• Yes. His money is enough.

Jean wants to buy 2 small boxes of gummy bears at Php 59 a box. About how much will she pay for it?

• About Php 120.

• About Php 1 200.

• About Php 200.

• About Php 150.

Answer explanation

Round off 59 ,it is 60. 60 times 2 = 120

The estimated product of two numbers is 400. One numbers is 38. Which of the following is the possible value of the other number?

• 18

• 11

• 20

• 40

Answer explanation

When you round off 38, it is 40. Round off 11, it is 10. 40 times 10 = 400