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Question

Simplify the expression.

(i) 45 ÷ 5 + 20 × 4 - 12 (ii) 38 - 8 × 2 ÷ 5 + 13

(iii) 53 + 47 ÷ 3221 (iv) 3 × 4 85 + 5 - 15 ÷ 3 + 2

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Solution

(i)
45÷5+20×4-12=9+80-12=89-12=77
(ii)
38-8×2÷5+13=30×2÷5+13=60÷5+13=12+13=25

(iii)
53+47÷3221=53+47×2132=53+47×21 332 8=53+38
=5×83×8+3×38×3=4024+924=40+924=4924
(iv)
3×485+5-15÷3+2=3×485+5-5+2=3×485+2=3×340+2=3×342=1026

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