Percentages

A percentage is a fraction of 100, so x% of a number is the number × x ÷ 100. Exam questions also run it backwards, giving you the part and the percentage and asking for the whole.

🎯 Try it yourself

Tap an answer. You'll see if it's right, and why. Easy ones come first.

1. Q1Easy

   What is 20% of 400?

   1. A60
   2. B80
   3. C800
   4. D8
   Show answer

   Answer: B. 80

   💡 20% of 400 = 20 × 400 ÷ 100 = 80.

2. Q2Easy

   Neha scored 450 out of 500. What percentage is that?

   1. A95%
   2. B90%
   3. C450%
   4. D93%
   Show answer

   Answer: B. 90%

   💡 450 ÷ 500 × 100 = 90%.

3. Q3Easy

   What is 10% of 380?

   1. A34
   2. B18
   3. C32
   4. D38
   Show answer

   Answer: D. 38

   💡 10% of 380 = 10 × 380 ÷ 100 = 38.

4. Q4Medium

   What is 30% of 940?

   1. A262
   2. B228
   3. C658
   4. D282
   Show answer

   Answer: D. 282

   💡 30% of 940 = 30 × 940 ÷ 100 = 282.

5. Q5Medium

   A worker's salary rises by 40% and then falls by 40%. Net change?

   1. ANo change
   2. B40% increase
   3. C16% decrease
   4. D6% decrease
   Show answer

   Answer: C. 16% decrease

   💡 100 → 140 → 140 × (100 − 40)/100 = 84, a net change of 84 − 100.

6. Q6Medium

   What is 5% of 840?

   1. A52
   2. B420
   3. C42
   4. D33
   Show answer

   Answer: C. 42

   💡 5% of 840 = 5 × 840 ÷ 100 = 42.

7. Q7Hard

   What is 120% of 2,150?

   1. A25,800
   2. B2,580
   3. C2,560
   4. D2,180
   Show answer

   Answer: B. 2,580

   💡 120% of 2,150 = 120 × 2,150 ÷ 100 = 2,580.

8. Q8Hard

   Pass mark is 35%. Fatima scored 188 and failed by 22 marks. Maximum marks?

   1. A720
   2. B600
   3. C700
   4. D537
   Show answer

   Answer: B. 600

   💡 Pass mark = 188 + 22 = 210 = 35% of the maximum, so maximum = 210 × 100 ÷ 35 = 600.