Big Ideas Unit 4 - Review

Multiplication Patterns

100

Find the product.

72 x 10³ =

72,000

200

Find the product.

30 x 900 = 

27,000

300

Find the product.

10² x 41 =

4,100

400

Find the missing factor.

600 x ____ = 24,000

40

500

Find the missing factor.

___ x 10³ = 26,000

26

Estimating Product

100

Estimate the product.  Explain whether your estimate is an overestimate or an underestimate.

44 X 81 = 

3,200; Underestimate

200

Estimate the product.  Explain whether your estimate is an overestimate or an underestimate.

29 x 67 =

2,100; Underestimate

300

Estimate the product.  Explain whether your estimate is an overestimate or an underestimate.

504 x 302 = 

150,000; Underestimate

400

Estimate the product.  Explain whether your estimate is an overestimate or an underestimate.

797 x 29 =

24,000; Overestimate

500

Earth travels about 1,118 miles in 1 minute.  About how far does Earth travel in 1 hour?

1 hour = 60 minutes

1,118 miles = 1,000 miles 

60 minutes x 1,000 miles = 60,000 miles

So, Earth travels about 60,000 miles in 1 hour

Multiply by One-Digit Numbers

100

663 x 5 = 

3,315

200

1,973 x 7 = 

13,811

300

75,028 x 6 

450,168

400

The Great Western Trail is 355 miles longer than 4 times the length of the Iditarod trail.  The Iditarod Trail is 1,025 miles long.  How long is the Great Western Trail? 

(1,025 length of Iditarod Trail x 4) + 355 miles = 4,455 miles 

500

A school buys 5 tablets and 5 laptops.  Each tablet cost $379.  Each laptop cost $449.  How much does the school pay for laptops than it pays for tablets?

($449 per laptop x 5) - ($379 per tablet x 5) = $350 more for the laptops

Multiply by Two-Digit Numbers

100

45 x 35 = 

1,575

200

206 x 74 =

15,244

300

5,082 x 69 =

350,658

400

A multiplex has 8 different movie theaters.  Each theater has 462 seats.  How many seats are in the multiplex? 

8 theaters x 462 seats in each =

3,696 seats in the multiplex

500

An interstellar object travels 85,700 miles in 1 hour.  How far does the object travel in 5 hours? 

85,700 miles x 5 hours = 428,500 miles

Multiply by Multi-Digit Numbers

100

612 x 143 =

87,516

200

899 x 475 =

427,025

300

6,182 x 794 =

4,908,508

400

A Koala sleeps 18 hours each day.  How many minutes does the Koala sleep in 1 year?

(365 days in a year x 18 hours each day) x 60 minutes in an hour = 394,200 minutes

500

The drivers at a warehouse need to deliver 40,000 packages each day.  The warehouse has 128 trucks. Each truck has 350 packages.  The drivers deliver all of the packages on the trucks.  Do the warehouse drivers deliver enough packages?

 40,000 packages need to go - (350 packages x 128 trucks) = 4,800 over

Yes, enough packages are delivered.