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Elementary Mathematics Flashcards

6 cards from real CDS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 Elementary Mathematics flashcards as text

  1. If a train travels 360 km in 4 hours, what is its speed in km/h?

    Answer: 90

    Speed = Distance / Time = 360 / 4 = 90 km/h.

  2. What is 15% of 240?

    Answer: 36

    15% of 240 = (15/100) × 240 = 36.

  3. A rectangle has length 12 cm and width 7 cm. What is its area?

    Answer: 84 sq cm

    Area of rectangle = length × width = 12 × 7 = 84 sq cm.

  4. Simplify: (3/4) ÷ (9/16)

    Answer: 4/3

    (3/4) ÷ (9/16) = (3/4) × (16/9) = 48/36 = 4/3.

  5. What is the LCM of 12 and 18?

    Answer: 36

    The LCM of 12 and 18 is 36, as it is the smallest number divisible by both.

  6. A shopkeeper buys an item for $80 and sells it for $100. What is the profit percentage?

    Answer: 25%

    Profit % = (Profit / Cost Price) × 100 = (20/80) × 100 = 25%.

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Sources & references

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  1. upsc.gov.in — Test delivery, fees, exam format, passing score, retake policy, time limit · verified Oct 2026