Interest, ratio and average practice set 1
ब्याज, अनुपात और औसत प्रैक्टिस सेट 1
20 questions · 22 minutes · Medium · मध्यम · For all exams
Simple and compound interest, ratio and proportion, and averages.
साधारण और चक्रवृद्धि ब्याज, अनुपात और औसत।
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See if each answer is right, with the explanation, before moving on. No timer.
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Learn the shortcuts
- Mixtures in seconds: the alligation (cross) rule
- Time and work in seconds: the LCM (total work) method
- Average speed trick for equal distances: 2xy ÷ (x + y)
- Successive percentage change in one step: a + b + ab/100
- Difference between compound and simple interest for 2 years: P × (r/100)²
- Multiply by 5, 25 and 125 instantly
- Unit digit of big powers using cyclicity
- Fractions as percentages: the table every exam topper knows
- Square any number ending in 5 in seconds (Vedic maths)
- Squares of numbers near 100, 1000 or 50 (Yavadunam method)
- Multiply numbers near 100 instantly (Nikhilam sutra)
- Multiply any number by 11 in your head
- Two-digit multiplication: vertically and crosswise (Urdhva Tiryagbhyam)
- Find the square root of a 4-digit perfect square in 10 seconds
- Cube root of a perfect cube in one look
- Percentage tricks: fractions, swaps and successive change
- Average shortcuts: assumed mean, middle term and replacements
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