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Math Facts
Halving and Doubling
Break a factor apart into two or more numbers (using place value)
Factor a Factor
Round a factor and adjust
100

What is 3x3

9

100

What is 12x3

6 x 6 = 36

100

12 x 6

10 x 6 = 60

2 x 6 = 12

60 + 12 = 72

100

15 x 6

3 x 5 x 6 = 90

100

11 x 9

10 x 9 = 90

1 x 9 = 9

90 + 9 = 99

200

What is 48 ÷ 6?

8

200

What is 18x5

9 x 10 = 90

200

16 x 7

10 x 7 = 70

6 x 7 = 42

70 +42 = 112

200

21 x 8

3 x 7 x 8 = 168

200

19 x 6

20 x 6 = 120

1 x 6 = 6

120 - 6 = 114

300

What is 8X6

48

300

What is 12x7

6 x 14 = 84

300

21 x 9

20 x 9 = 180

1 x 9 = 9

180 + 9 = 189

300

12 x 6

3 x 4 x 6 = 72

or

2 x 6 x 6 = 72

300

24 x 5

25 x 5 = 125

1 x 5 = 5

125 - 5 = 120

400

What is 24 ÷ 8?

3

400

What is 15x8

30 x 4 = 120

400

15 x 5 x 3

10 x 5 = 50

5 x 5 = 25

50 + 25 = 75

75 x 3 = 225

400

15 x 2 x 9

3 x 5 x 2 x 9 = 270

400

17 x 8

20 x 8 = 160

3 x 8 = 24

160 - 24 = 136

500

What is 12x11

132

500

What is 14 x 5 x 3

7 x 10 x 3 = 210

500

19 x 2 x 7

10 x 2 = 20

9 x  2 = 18

20 + 18 = 38

38 x 7 = (30x7) + (8x7) = 210+56 = 266

500

22 x 3 x 5

2 x 11 x 3 x 5 = 330

500

32 x 4 x 3

30 x 4 = 120

2 x 4 = 8

120 + 8 = 128

128 x 3 = (120 x 3) + (8 x 3) = 384