# Doubling and Halving. CATEGORY 1 Doubling and Halving with basic facts.

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Doubling and Halving

CATEGORY 1 Doubling and Halving with basic facts.

1 x 16 2 x 8 4 x 4 8 x 2 16 x 1

1 x 36 2 x 18 4 x 9

1 x 20 2 x 10 4 x 5

1 x 24 2 x 12 4 x 6 8 x 3

1 x 48 2 x 24 4 x 12 8 x 6 16 x 3

1 x 40 2 x 20 4 x 10 8 x 5

1 x 12 2 x 6 4 x 3

1 x 32 2 x 16 4 x 8 8 x 4 16 x 2 32 x 1

1 x 56 2 x 28 4 x 14 8 x 7

CATEGORY 2 Doubling and Halving with 1 x 2-digit and 1 x 3-digit numbers.

8 x 16 4 x 32 2 x 64

8 x 32 4 x 64 2 x 168

36 x 5 18 x 10 9 x 20

8 x 125 4 x 250 2 x 500

84 x 5 42 x 10 21 x 20

35 x 8 70 x 4 140 x 2

125 x 8 250 x 4 500 x 2

345 x 8 690 x 4 1380 x 2

8 x 29 4 x 58 2 x 116

CATEGORY 3 Doubling and Halving with 2 x 2-digit numbers.

3 x 60 6 x 30 12 x 15

9 x 56 18 x 28 36 x 14

2 x 280 4 x 140 8 x 70 16 x 35

104 x 3 52 x 6 26 x 12

4 x 120 8 x 60 32 x 15

100 x 4 50 x 8 25 x 16

112 x 2 56 x 4 28 x 8 14 x 16

360 x 3 180 x 6 90 x 12 45 x 24

2 x 1440 4 x 720 8 x 360 16 x 180 32 x 90 64 x 45

CATEGORY 4 For investigation of what happens when you third or triple or quarter and quadruple numbers.

9 x 12 3 x 36 1 x 108

27 x 15 9 x 45 3 x 135 1 x 405

36 x 18 72 x 9 216 x 3 648 x 1

15 x 16 60 x 4 240 x 1

25 x 48 100 x 12 400 x 3 1200 x 1

64 x 35 16 x 140 4 x 560 1 x 2240

18 x 12 9 x 24 4.5 x 36 2.25 x 72

6 x 12 3 x 24 1.5 x 48

6 x 24 3 x 48 1.5 x 96

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