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1.
Question 1. Find the
following products : Solution:
2.
3.
Question 2. Evaluate the
following : (i) 102 x 106 (ii) 109 x 107 (iii) 35 x 37 (iv) 53 x 55 (v) 103 x 96 (vi) 34 x 36 (vii) 994 x 1006 Solution: (i) 102 x 106 = (100 + 2) (100 + 6) = (100)2 + (2 + 6) x 100 + 2 x 6 = 10000 + 800 + 12 = 10812 (ii) 109 x 107 = (100 + 9) (100 + 7) = (100)2 + (9 + 7) x 100 + 9 x 7 =10000 + 1600 + 63 = 11663
4.
(iii) 35 x
37 = (30 + 5) (30 + 7) = (30)2 + (5 + 7) x 30 + 5 x 7 = 900 + 12 x 30 + 35 = 900 + 360 + 35 = 1295 (iv) 53 x 55 = (50 + 3) (50 + 5) = (50)2 + (3 + 5) x 50 + 3 x 5 = 2500 + 8 x 50 + 15 = 2500 + 400+ 15 = 2915 (v)103 x 96 = (100 + 3) (100-4) = (100)2 + (3 – 4) x 100 + 3 x (-4) = 10000+ (-1) x 100-12 = 10000 – 100 – 12 = 10000 – 112 = 9888 (vi) 34 x 36 = (30 + 4) (30 + 6) = (30)2 + (4 + 6) x 30 + 4 x 6 = 900 + 10 x 30 + 24 = 900 + 300 + 24 = 1224 (vii) 994 x 1006 = (1000 – 6) (1000 + 6) = (1000)2 + (-6 + 6) x 1000 + (-6) x 6 = 1000000 + 0-36 = 1000000-36 = 999964
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