Chapter 4

Multiply Mentally

100

4x10

40

200

10x7

70

300

200x3

600

400

5x400

2,000

500

5x2,000

10,000

Multiply

100

41x2

82

200

46x3

138

300

231x4

924

400

1,259x5

6,295

500

1,692x5

8,460

Multiply

100

33x2

66

200

27x3

81

300

341x4

1,364

400

1,692x5

8,460

500

1,055x4

4,220

Word Problems

100

Bart has 208 model cars. Manny has 3 times as many model cars. How many model cars does Manny have?

208x3 = 624 cars

200

Dana jogs 1,055 minutes a month. How many minutes will she job in 4 months?

1,055x4= 4,220 minutes

300

Mr. and Mrs. Hartford want to buy a car that costs $8,675. Mr. Hartford save $1,305 each month for 3 months. Mrs. Hartford save $1,574 each month for 3 months. If they combine their money, how much will they have? Will they have enough money to buy the car?

$1,305 x 3= $3,915

$1,574 x 3= $4,722

$3,915 + $4,722 = $8,637

No

400

Number of Campers for One Week:

Camp Augustine  - 4,216

Camp Timber - 1,840

Camp Bristol - 876

Camp Bell - 349

If the same number of campers go to Camp Augustine each week, about how many campers will go there over 3 weeks?

4,000 x 3=12,000

500

Number of Campers for One Week:

Camp Augustine  - 4,216

Camp Timber - 1,840

Camp Bristol - 876

Camp Bell - 349

The same number of campers go to Camp Bristol each week. About how many campers will go there over 5 weeks? Is this an estimate or exact answer?

900x5=4,500

estimate

More Word Problems

100

Mitch has 305 marbles. Paul has 3 times as many marbles. How many marbles does Paul have? 

915 marbles

200

Elizabeth has 2,038 stamps in an album. How many stamps will she have in 4 albums?

8,152 stamps

300

Number of Shells Collected in One week:

Group 1 - 2,632

Group 2 - 2,018

Group 3 - 821

Group 4 - 320

If Group 3 collects the same number of shells in a second week, about how many shells will they have collected in those 2 weeks?

800x2=1,600 shells

400

Number of Shells Collected in One week:

Group 1 - 2,632

Group 2 - 2,018

Group 3 - 821

Group 4 - 320

Group 2 collects the same number of shells each week. How many shells will they collect in 4 weeks? Is an estimate or exact answer needed?

exact

2,018x4=8,072 shells

500

Number of Campers for One Week:

Camp Augustine  - 4,216

Camp Timber - 1,840

Camp Bristol - 876

Camp Bell - 349

The same number of campers go to camp each week. How many more campers go to Camp Timber in 3 weeks than go to Camp Bell in 5 weeks? Is an estimate or exact answer needed?

exact

Camp Timber = 1,840x3=5,520

Camp Bell= 349x5=1,745

5,520-1,745 = 3,775 more campers