Tutorial World
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Mental Calculation (8.1)

Do all the questions mentally, do not attempt written workings.

A. Give the answers.

1. 25 + 25

2. 13 + 7

3. 40 - 18

4. 80 x 5

5. 38 - 23

6. 408 ÷ 8

7. 105 + 74

8. 20 x 20

B. Find the answers.

1. What number is 4 less than 289?

2. Find the value of 9 + 2 + 9.

3. Find the value of 100 - 5 - 15.

4. Find the difference between 75 and 40.

5. What number is 20 more than 193?

6. What number is 50 less than 1000?

7. Find the value of 307 x 4.

8. Find the value of 366 ÷ 6.

C. Solve the problems below.
1. Francis saves $10 a day. At the end of 30 days, how much money does he have?
2. Mr Tan sold 50 oranges on Sunday. He sold 15 oranges less on Monday than on Sunday. How many oranges did he sell on both days?
3. There are 12 pencils in each box. How many pencils are there in 15 boxes?
4. 6 persons shared $540 equally. How much did each person receive?
5. A farmer had 37 eggs. He broke 2 eggs and his family ate 8 eggs. How many eggs had he left?


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