Math Review Chapter 5

Which number closest to the sum of 272 and 611 (estimate)? 400 1200 1000 900

900

Which of the following is closest to the product of 68 and 42 ? 280 2800 28,000 280,000

2,800

An average of 20,000 pounds of hamburger is eaten each day in Pennsylvania. How much hamburger is eaten in one week?

140,000 pounds

How much hamburger is eaten in one month? ( 30 days in a month)

600,000 pounds

Do we eat more or less than a million pounds in a year?

More

During the past decade 18,786,110 people visited New York city During the past decade 18,786,110 people visited New York city. Round that number to the closest million.

19,000,000

Round 18,786,110 to the nearest thousand.

18,786,000

In New York there are about 60 restaurants for every 10,000 visitors In New York there are about 60 restaurants for every 10,000 visitors. About how many restaurants are there in New York City?

114, 000 restaurants

Greater than or less than? 12,000,000 ____ 6,988,676

12,000,000 > 6,988,676

459,799 _____ 456,989

459,759 > 456,989

43,000,000,000 _____ 6 trillion

43,000,000,000 < 6 trillion

9 * 7 = 90 * 7 = 9 * 700 =

63 630 6,300

6 * 3 = 60 * 30 = 600 * 30 =

18 1,800 18,000

Multiply 9 * 56 =

504

Multiply 32 * 6 =

192

Multiply 84 * 36 =

3024

Multiply 32 * 17 =

544

Challenge Problems: These will not be on your test, but be offered as bonus problems. (similar ones to these)

Use the odd digits below to make the largest possible sum. 9,8,7,6,5,4,3,2,1,0

(strategy: use largest digits first) Two possible answers 973 + 51 = 1024 953 + 71 = 1024 (strategy: use largest digits first)

Use even digits below to make the smallest possible sum. 9,8,7,6,5,4,3,2,1

(strategy: use smallest numbers first) Solution 204 - 86 = 118 (strategy: use smallest numbers first)