Ron Gwairown always writes numbers down back to front. At school, he was once asked to do the following calculation:
14 x 82
In his exercise book Ron wrote down:
41 x 28
1. What answer did he get?
2. What answer should he have got?
3. Investigate other pairs of calculations of this type? What can you discover?
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Topics: Starter  Arithmetic  Investigations  Place Value
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44 x 55 44 x 66 44 x 77 44 x 88 44 x 99 45 x 54 46 x 32 46 x 64 46 x 96 47 x 74 48 x 21 48 x 42 48 x 63 48 x 84 49 x 94 51 x 15 52 x 25 53 x 35 54 x 45 55 x 11 55 x 22 55 x 33 55 x 44 55 x 55 55 x 66 55 x 77 55 x 88 55 x 99 56 x 65 57 x 75 58 x 85 59 x 95 61 x 16 62 x 13 62 x 26 62 x 39 63 x 12 63 x 24 63 x 36 63 x 48 64 x 23 64 x 46 64 x 69 65 x 56 66 x 11 
66 x 22 66 x 33 66 x 44 66 x 55 66 x 66 66 x 77 66 x 88 66 x 99 67 x 76 68 x 43 68 x 86 69 x 32 69 x 64 69 x 96 71 x 17 72 x 27 73 x 37 74 x 47 75 x 57 76 x 67 77 x 11 77 x 22 77 x 33 77 x 44 77 x 55 77 x 66 77 x 77 77 x 88 77 x 99 78 x 87 79 x 97 81 x 18 82 x 14 82 x 28 83 x 38 84 x 12 84 x 24 84 x 36 84 x 48 85 x 58 86 x 34 86 x 68 87 x 78 88 x 11 88 x 22 
88 x 33 88 x 44 88 x 55 88 x 66 88 x 77 88 x 88 88 x 99 89 x 98 91 x 19 92 x 29 93 x 13 93 x 26 93 x 39 94 x 49 95 x 59 96 x 23 96 x 46 96 x 69 97 x 79 98 x 89 99 x 11 99 x 22 99 x 33 99 x 44 99 x 55 99 x 66 99 x 77 99 x 88 99 x 99 
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... 
Teacher, do your students have
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