14. a) Calculate 27 + (42 ÷ 7 + 3) ÷ 3
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b) Work out 18 (66 – 10)
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c) Write the missing number to it correct.
9 + 7 x ………….. – 18 = 54
d) A number is multiplied by itself and 8 is added. The total is 72.
What is the number?
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