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Using BY SUBTRACTION AND BY ADDITION you can easily check your change. Suppose you offer 50p for something costing 18p. � 50 - 18 = 32 www.classtopper.com CHECK YOUR CHANGE To take 18 from 50, we note that 18 is close to 20, so we take 20 away from 50 (to get 30) and add 2 back on. 32
� Similarly in 73 - 49 we decide to take 50 away from 73 and then add 1 back on. We get 24. Try these: www.classtopper.com 1) 62 2) 84 3) 71 4) 43 5) 55 36 - 48 - 27 - 16 - 28 - Behold the heaven, the earth, the sea; all that is bright in them or above them; all that creep or fly or swim; all have forms because all have number. Take away number and they will be nothing... ST AUGUSTINE 33
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 and 12: � $10 - $2.30 = $7.70 www.classto
Page 13 and 14: www.classtopper.com You subtract cr
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: Now suppose that there is a carry f
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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