Maths FROM 2

Addition of fractions

Ex: evaluate a)2/27 + 6/27, b)5/a + 2/a

Solution: a) 2/27 + 6/27 = 2+627 = 8/27 b)5/a + 2/a = 5+2a = 7/a

Ex: evaluate a)3/4 + 1/6, b)5/9 + 2/3 + 5/6

Solution: a) 3/4 + 1/6 b) 5/9 + 2/3 + 5/6

18+4 = 22/24 = 11/12 10+12+15 = 33/18 = 3118

24 18

Ex: evaluate a)234 + 5512 b)4910 + 215+613

Solution: a) 234 + 5512 b) 4910 + 215+613

7 9+5 = 71412 = 776 = 816 12 81+18+30 = 1212990 = 124330

12 90

Subtraction of fractions

Ex: evaluate a)4/5 – 3/5, b)13/15 – 4/15

Solution: a) 4/5 – 3/5 = 4-35 = 1/5 b)13/15 – 4/15 = 13-415 = 9/15

Ex: evaluate a)1/3 – 1/4, b)5/7 – 4/6

Solution: a) 1/3 – 1/4 b) 5/7 – 4/6

4-3 = 1/12 30-28 = 2/42 = 11/21

12 42

Ex: evaluate a) 312 - 115 b) 134 - 223

Solution: a) 312 - 115 b) 134 - 223

2 5-2 = 2310 -1 9-8 = -1112

10 12

Multiplication of fractions

a/b * c/d = a*cb*d where b, d ≠ 0

Ex: evaluate a)3/5 * 4/7, b) 4 * 1/5

Solution: a) 3/5 * 4/7 = 3*45*7 = 12/35 b) 4 * 1/5 = 4/5

Ex: evaluate a) 412 * 323 b) 2/5 * 318

Solution: a) 412 * 323 = 9/2 * 11/8 = 33/2 = 1612

2/5 * 318 = 2/5 * 25/8 = 5/4 = 114

par Claude Foumtum

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