X Powers of 10
Estimating
Multiply With Area Models
Standard Algorithm
Word Problems
100

What is 30 x 10?

300

100

32 x 31

900

100

15 x 20

300

100

22 x 11

242

100

There are 36 pencils in a box. There are 15 boxes in a carton. Mr. K ordered 6 cartons for class. How many pencils did he get? 

540 crayons

200

Solve: 40 x 50

2000

200

43 x 25

1200

200

47 x 23

1081

200

35 x 21

735

200

There are 12 inches in a foot. In September, James orders 32 feet of ribbon for the Craft Club. In January, he orders 9 feet less. How many inches of ribbon did James order in total? 

660 inches

300

70 x 60 = ____

4200

300

54 x 26

1500

300

62 x 45

2790

300

56 x 43

2408

300

27 students in 4th grade each collected an average of 18 cans of food for a food drive. The 23 students in 3rd grade collected an average of 21 cans each. How many more cans did 3rd grade students collect than 4th grade students? 

3 more cans

400

900 x 40

36,000

400

52 x 87

4500

400

94 x 97

9118

400

78 x 69

5382

400

Acme Widgets ordered 17 boxes of 85 widgets each. They also ordered 15 boxes with 90 thingamajigs in each. How many more widgets than thingamajigs did they order? 

95 more widgets

500

15 x 60 = ?

900

500

81 x 38

3200

500

132 x 45

5940

500

372 x 64

23,808

500

Fred hiked 16 miles each day on a 17-day trip. Bob hiked 13 miles each day on an 18-day trip. In all, how many more miles did Fred hike than Bob hiked? 

38 more miles