Topic 4: Multiply Greater Numbers

Multiples of 10

100

10 x 16 =

160

200

40 x 16 =

640

300

30 x 16 =

480

400

60 x 16 =

960

500

40 x 600 =

24,000

Estimate Products

100

Which expressions have an estimate of 3,200?

a. 14 x 87

b. 48 x 57

c. 41 x 78

d. 38 x 82

e. 25 x 31

c. 41 x 78

d. 38 x 82

2 digit x 2 digit

100

34 x 47 =

a. 1,388

b. 1,478

c. 1,578

d. 1,598

d. 1,598

200

23 x 30 =

690

300

38 x 44 =

1,672

400

50 x 80 =

4,000

3 digit x 2 digit

100

26 x 144 =

a. 6

b. 170

c. 3,744

d. 3,834

c. 3,744

200

867 x 41 =

a. 33,813

b. 34, 680

c. 35,547

d. 36,414

c. 35,547

Expressions

100

Select all that equal 430

a. 43 x 10

b. (40 x 10) + 3

c. (40 x 10) + (30 x 10)

d. (40 x 10) + (3 x 10)

e. (30 x 10) + (4 x 10)

a. 43 x 10

d. (40 x 10) + (3 x 10)

200

How would I find 49 x 21

a. 4 x 9 x 2 x 1

b. (40 + 9) x (20 + 1)

c. (40 + 7) x (21 + 2)

d. 40 x 9 x 20 x 1

b. (40 + 9) x (20 + 1)

300

Which expressions show 12 x 37?

a. 12 x 37

b. 12 x (30+7)

c. 12 + 30 + 12 + 7

d. (12 x 30) + (12 x 7)

e. 360 + 91

a. 12 x 37

b. 12 x (30+7)

d. (12 x 30) + (12 x 7)

400

800 x ________ = 40,000

a. 5

b. 50

c. 500

d. 5,000

b. 50