Double these numbers and write down the answers in the back of your book:
1  5  8  12  13  16 
24  38  52  53  56  75 
571  985  1133  1315  1607  1771 
1.1  0.21  0.089  0.0089  0.00097  9.49 
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Topics: Starter  Arithmetic
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1 x 2 = 2  5 x 2 = 10  8 x 2 = 16  12 x 2 = 24  13 x 2 = 26  16 x 2 = 32 
24 x 2 = 48  38 x 2 = 76  52 x 2 = 104  53 x 2 = 106  56 x 2 = 112  75 x 2 = 150 
571 x 2 = 1142  985 x 2 = 1970  1133 x 2 = 2266  1315 x 2 = 2630  1607 x 2 = 3214  1771 x 2 = 3542 
1.1 x 2 = 2.2  0.21 x 2 = 0.42  0.089 x 2 = 0.178  0.0089 x 2 = 0.0178  0.00097 x 2 = 0.00194  9.49 x 2 = 18.98 
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