Factorization
Mental Multiplication
Exponents
Solve by Rounding
Double-Digit Multiplication
100

Find the prime factorization: 64

26

100

30 x 2

60

100

Write as an exponent: 2 x 2 x 2

23

100

10 x 12

120

200

Find the prime factorization:100

22 x 52

200

40 x 30

1,200

200

Write as an exponent: 3 x 3 x 3 x 3 x 3

35

200

What is the best estimate using rounding?

48 x 22

1,000

200

12 x 13

156

300

3 x 3 x 3 x 5 x 5

3x 52

300

200 x 500

100,000

300

Write as an exponent: 8 x 8 x 8

83

300

What is the best estimate using rounding?

68 x 36

2,800

300

22 x 43

946

400

Find the prime factorization: 81

34

400

110 x 30

3,300

400

Write as repeated multiplication: 112

11 x 11

400

What is the best estimate using rounding?

42 x 38

1,600

400

There are 55 boxes of candy with 42 bars in each box. How many candy bars are there in all? 

2,310

500

Find the prime factorization:121

112

500

80 x 700

56,000

500

Write as repeated multiplication: 49

4 x 4 x 4 x 4 x 4 x 4 x 4 x 4 x 4

500

What is the best estimate using rounding?

77 x 64

4,800

500

There are 86 busses with 49 students on each bus. How many students are there altogether?

4,214

M
e
n
u