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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11 x 11 11 x 22 11 x 33 11 x 44 11 x 55 11 x 66 11 x 77 11 x 88 11 x 99 12 x 21 12 x 42 12 x 63 12 x 84 13 x 31 13 x 62 13 x 93 14 x 41 14 x 82 15 x 51 16 x 61 17 x 71 18 x 81 19 x 91 21 x 12 21 x 24 21 x 36 21 x 48 22 x 11 22 x 22 22 x 33 22 x 44 22 x 55 22 x 66 22 x 77 22 x 88 22 x 99 23 x 32 23 x 64 23 x 96 24 x 21 24 x 42 24 x 63 24 x 84 25 x 52 26 x 31 
26 x 62 26 x 93 27 x 72 28 x 41 28 x 82 29 x 92 31 x 13 31 x 26 31 x 39 32 x 23 32 x 46 32 x 69 33 x 11 33 x 22 33 x 33 33 x 44 33 x 55 33 x 66 33 x 77 33 x 88 33 x 99 34 x 43 34 x 86 35 x 53 36 x 21 36 x 42 36 x 63 36 x 84 37 x 73 38 x 83 39 x 31 39 x 62 39 x 93 41 x 14 41 x 28 42 x 12 42 x 24 42 x 36 42 x 48 43 x 34 43 x 68 44 x 11 44 x 22 44 x 33 44 x 44 
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 
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