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Mental maths, fractions and percentages.
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Worked examples
Twenty questions from this topic with their answer and the method used. Start the quiz above to practise with other variants.
What is the mean of 7, 11 and 18?
Answer 12
(7 + 11 + 18) ÷ 3 = 12.
If 3x + 5 = 152, what is x?
Answer 49
x = (152 − 5) ÷ 3 = 49.
What is 48 × 7?
Answer 336
48 × 7 = 336.
What is 15% of 820?
Answer 123
820 × 15 ÷ 100 = 123.
What is 3/4 + 5/4?
Answer 2
(3 + 5) ÷ 4 = 2.
What is 225 ÷ 9?
Answer 25
25 × 9 = 225, 225 ÷ 9 = 25.
What is 23²?
Answer 529
23² = 23 × 23 = 529.
What is 14 + 9?
Answer 23
14 + 9 = 23.
What is the mean of 32, 36 and 43?
Answer 37
(32 + 36 + 43) ÷ 3 = 37.
If 3x + 5 = 47, what is x?
Answer 14
x = (47 − 5) ÷ 3 = 14.
What is 52 × 7?
Answer 364
52 × 7 = 364.
What is 15% of 760?
Answer 114
760 × 15 ÷ 100 = 114.
What is 16/4 + 18/4?
Answer 8.5
(16 + 18) ÷ 4 = 8.5.
What is 153 ÷ 9?
Answer 17
17 × 9 = 153, 153 ÷ 9 = 17.
What is 44²?
Answer 1,936
44² = 44 × 44 = 1936.
What is 47 + 15?
Answer 62
47 + 15 = 62.
What is the mean of 9, 13 and 20?
Answer 14
(9 + 13 + 20) ÷ 3 = 14.
If 3x + 5 = 134, what is x?
Answer 43
x = (134 − 5) ÷ 3 = 43.
What is 45 × 7?
Answer 315
45 × 7 = 315.
What is 15% of 300?
Answer 45
300 × 15 ÷ 100 = 45.