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Multiplying a number by 11 is incredibly easy – astonish your parents and friends with this. To multiply any 2-figure number by 11 we just put the total of the two figures between the 2 figures. � 26 x 11 = 286 www.classtopper.com IMPRESS YOUR PARENTS 26 x 11 = 2 8 6 2 + 6 = 8 Notice that the outer figures in 286 are the 26 being multiplied. And the middle figure is just 2 and 6 added up. 40
� So 72 x 11 = 792 Multiply by 11: 1) 43 2) 81 3) 15 4) 44 5) 11 � 77 x 11 = 847 This involves a carry figure because 7 + 7 = 14 We get 77 x 11 = 7147 = 847. Multiply by 11: 6) 88 7) 84 8) 48 9) 73 10) 56 � 234 x 11 = 2574 We put the 2 and the 4 at the ends. We add the first pair: 2 + 3 = 5, and we add the last pair: 3 + 4 = 7. Several multiplication methods have been shown so far. Find the sums below using three different methods for each: A) 98 x 92 B) 19 x 11 www.classtopper.com 41
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 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: Practise a few: 1) 21 2) 23 3) 32 4
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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