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TABLES MAGIC Don’t know your tables? Never mind, in this system you don’t need them beyond 5 x 5! � Suppose you need 8 x 7 8 is 2 below 10 and 7 is 3 below 10. Think of it like this: 8 2 7 3 5 6 answer The answer is 56. The diagram below shows how you get it. 8 2 7 3 5 6 answer www.classtopper.com 12
www.classtopper.com You subtract crosswise: 8 - 3 or 7 - 2 to get 5, the first figure of the answer. And you multiply vertically: 2 x 3 to get 6, the last figure of the answer. That’s all you do: see how far the numbers are below 10, subtract one number’s deficiency from the other number, and multiply the deficiencies together. � 7 x 6 = 42 7 3 6 4 3 1 2 = 42 Here there is a carry: the 1 in the 12 goes over to make the 3 into 4. Multiply these: 1) 8 2) 9 3) 8 4) 7 5) 9 6) 6 8 – – 7 – – 9 – – 7 – – 9 – – 6 – – The whole heaven is number and harmony ARISTOTLE 13
Page 3 and 4: www.classtopper.com On seeing this
Page 5 and 6: www.classtopper.com caught between
Page 7 and 8: 30 CHECK YOUR BILL 32 CHECK YOUR CH
Page 9 and 10: � Similarly 10,000 - 1049 = 8951
Page 11: � $10 - $2.30 = $7.70 www.classto
Page 15 and 16: www.classtopper.com 88 - 12 98 - 2
Page 17 and 18: www.classtopper.com Try a few: 1) 1
Page 19 and 20: So: � 5 + 3 = 20 + 21 = 41 7 4 28
Page 21 and 22: The first part is the first number,
Page 23 and 24: Diagrammatically: 2 x 8 = 16 32 x 3
Page 25 and 26: � Now suppose we want the digit s
Page 27 and 28: www.classtopper.com So all numbers
Page 29 and 30: www.classtopper.com All sums, even
Page 31 and 32: Now suppose that there is a carry f
Page 33 and 34: � Similarly in 73 - 49 we decide
Page 35 and 36: � Similarly 234 x 7 = 1638 We get
Page 37 and 38: ) Multiply crosswise and add: 2x3 +
Page 39 and 40: Practise a few: 1) 21 2) 23 3) 32 4
Page 41 and 42: � So 72 x 11 = 792 Multiply by 11
Page 43 and 44: www.classtopper.com Divide by 9: 1)
Page 45 and 46: Divide these by 9: www.classtopper.
Page 47 and 48: www.classtopper.com To sum up, for
Page 49 and 50: Page 23 1) 2021 2) 624 3) 4216 4) 2
Page 51: www.classtopper.com ANSWERS Page 45

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