Double these numbers and write down the answers in the back of your book:
1  4  8  11  14  19 
23  40  51  57  76  87 
835  1649  2538  2773  3273  3517 
5  0.07  0.02  0.0022  0.00012  25.24 
Topics: Starter  Arithmetic
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1 x 2 = 2  4 x 2 = 8  8 x 2 = 16  11 x 2 = 22  14 x 2 = 28  19 x 2 = 38 
23 x 2 = 46  40 x 2 = 80  51 x 2 = 102  57 x 2 = 114  76 x 2 = 152  87 x 2 = 174 
835 x 2 = 1670  1649 x 2 = 3298  2538 x 2 = 5076  2773 x 2 = 5546  3273 x 2 = 6546  3517 x 2 = 7034 
5 x 2 = 10  0.07 x 2 = 0.14  0.02 x 2 = 0.04  0.0022 x 2 = 0.0044  0.00012 x 2 = 0.00024  25.24 x 2 = 50.48 
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Casio Classwiz CalculatorThere is currently a lot of talk about this new calculator being the best in its price range for use in the Maths classroom. The new ClassWiz features a highresolution display making it easier to view numerical formulas and symbols but it isn't a graphical calculator as such (it has the capacity to draw graphs on your smart phone or tablet, via a scannable QR code and an app). As well as basic spreadsheet mode and an equation solving feature you also get the ability to solve quadratic, cubic or quartic polynomial inequalities and the answer is given just as it should be written down, using the correct inequality symbols! This calculator has a highperformance processor and twice the memory of previous models ensuring speedy operation and superior computational power.more... 
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