Mental Math Quiz

1. Click the correct answer. Do not use a calculator: 55 - 33 = 24 - ?

12 2

14 3

2. Three of the following numbers add up to the number 31: 17, 4, 2, 19, 5?

True False

3. What is 10% of 10?

1.2 1.1

2 1

4. The average of four numbers is 7. If the average of first three numbers is 8 then find the fourth number?

3.5 3

4 4.5

5. What is the loss in percent, if a book costing Rs.110 is sold for Rs.100?

11% 9.8%

10% 9%

6. If 6 men can do a work in 20 days, how many days will 8 men take?

16 Days 14 Days

18 Days 15 Days

7. What is 90% of 90?

81 90

81.1 80.9

8. A Father is twice as old as his son. Sum of their ages is 60 years. Find the age of father?

35 years 38 years

40 years 45 years

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