Double-Double-Double
Over & Under Strategy
Doubling & Halving
Friendly Numbers
Associative and Commutative Properties
100

3 X 8

What is 24

100

2 x 19

What is 38

100

20 x 5

What is 100

100

5 x 2 x 6

What is 60

200

11 x 8

What is 88

200
5 x 29
What is 145
200

4 x 14

What is 56

200

1 x 2 x 22

What is 44

300

8 x 14

What is 112

300
3 x 99
What is 297
300

21 x 20

What is 420

300

10 x 49 x 10

What is 4900

400

8 x 43

What is 344

400
5 x 199
What is 955
400

50 x 18

What is 900

400

25 x 7 x 4 = 

What is 700

500

Joey is trying to figure out how many rose bushes his mom planted in the garden. He sees 13 rows of 8 rose bushes planted. How many rose bushes are in the garden?

What is 104

500

Roosevelt has 6 boxes of Legos. There are 29 pieces of Legos in each box. How many Lego pieces does Roosevelt have in all?

174 pieces

500

Kate is trying to determine the area of her living space to buy a rug that will fit the space. Her living space has a length of 25 square feet and a width of 16 square feet. What is the area of Kate's living space.

What is 400 square feet

500

250 x 782 x 4

782000