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Simplify the expressions: i. 45 ÷ 5 + 120 × 4 – 12ii. ( 3 8 – 8 ) × 2 ÷ 5 + 1 3 iii. 5/3 + 4/7 ÷ 32/21iv . 3 × { 4 [ 8 5 + 5 – ( 1 5 – 3 ) ] + 2 } |
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Answer» i. 45 ÷ 5 + 120 x 4 - 12 = 9 + 80 -12 = 89 - 12 = 77 ii. (38 - 8) x 2 ÷ 5 + 13 = 30 x 2 ÷ 5 + 13 = 12 + 13 = 25 iii. 5/3 + 4/7 ÷ 32/21 = 5/3 + 4/7 x 21/32 = 5/3 + 4/7 x 21/32 = 5/3 + 3/8 = 40/24 + 9/24 = 49/24 iv. 3 x {4[85 + 5 - (15 - 3)] + 2} = 3 x {4[90 - 5] + 2} = 3 x {4 x 85 + 2} = 3 x (340 + 2) = 3 x 342 = 1026 |
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