Write the expressions for each of the following using brackets. (a) Four multiplied by the sum of nine and two.
(b) Divide the difference between eighteen and six by four.
(c) Forty - five divided by three times the sum of three and two.
a) 
b) (18 – 6) ÷ 4
= 12 ÷ 4 = 3
c) Three times the sum of 3 and 2
= 45 ÷ {3 x (3 + 2)}
= 45 ÷ 15
= 3
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