Mathematics without a Calculator Flashcards
7 cards from real CAEC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Mathematics without a Calculator flashcards as text
What is 3/4 ÷ 3/8?
Answer: 2
Multiply by the reciprocal: 3/4 × 8/3 = 24/12 = 2.
What is 15% of 240?
Answer: 36
10% of 240 is 24 and 5% is 12, so 15% is 24 + 12 = 36.
Solve for x: 3(x − 4) = 2x + 5
Answer: 17
Expanding gives 3x − 12 = 2x + 5, so x = 17.
A rectangle has an area of 48 square metres and a length of 8 metres. What is its perimeter?
Answer: 28 m
The width is 48 ÷ 8 = 6, so the perimeter is 2(8 + 6) = 28 m.
What is the mean of the data set 4, 7, 9, 12, 13?
Answer: 9
The sum is 45 and there are 5 values, so the mean is 45 ÷ 5 = 9.
Which expresses 0.00045 in scientific notation?
Answer: 4.5 × 10^-4
The decimal point moves 4 places right to get 4.5, so the exponent is −4.
A recipe uses 3 cups of flour for every 2 cups of sugar. How many cups of sugar are needed with 9 cups of flour?
Answer: 6
9 cups of flour is 3 times the original, so sugar is 2 × 3 = 6 cups.
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