Mental Maths for Class 6

Introduction

Mental maths means solving mathematical problems in your mind without using a calculator or writing lengthy calculations. Practicing mental maths regularly improves speed, accuracy, concentration, and confidence.

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Addition

Solve Mentally

1. 25 + 34 = _____
2. 48 + 27 = _____
3. 67 + 15 = _____
4. 84 + 16 = _____
5. 56 + 29 = _____
6. 72 + 18 = _____
7. 39 + 41 = _____
8. 95 + 5 = _____
9. 46 + 23 = _____
10. 88 + 12 = _____
11. 124 + 25 = _____
12. 315 + 45 = _____
13. 208 + 92 = _____
14. 450 + 150 = _____
15. 720 + 80 = _____
16. 560 + 40 = _____
17. 325 + 175 = _____
18. 610 + 190 = _____
19. 415 + 85 = _____
20. 999 + 1 = _____

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Subtraction

1. 75 − 25 = _____
2. 90 − 35 = _____
3. 68 − 24 = _____
4. 100 − 45 = _____
5. 87 − 29 = _____
6. 150 − 50 = _____
7. 300 − 120 = _____
8. 500 − 250 = _____
9. 800 − 400 = _____
10. 1000 − 500 = _____
11. 625 − 125 = _____
12. 720 − 220 = _____
13. 900 − 450 = _____
14. 450 − 175 = _____
15. 840 − 340 = _____
16. 600 − 275 = _____
17. 999 − 499 = _____
18. 1000 − 250 = _____
19. 700 − 225 = _____
20. 850 − 450 = _____

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Multiplication

1. 5 × 8 = _____
2. 7 × 9 = _____
3. 12 × 5 = _____
4. 15 × 4 = _____
5. 25 × 4 = _____
6. 11 × 11 = _____
7. 20 × 15 = _____
8. 50 × 6 = _____
9. 12 × 12 = _____
10. 9 × 25 = _____
11. 30 × 30 = _____
12. 14 × 10 = _____
13. 13 × 5 = _____
14. 18 × 5 = _____
15. 40 × 12 = _____
16. 15 × 15 = _____
17. 16 × 25 = _____
18. 100 × 9 = _____
19. 22 × 4 = _____
20. 19 × 5 = _____

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Division

1. 40 ÷ 5 = _____
2. 81 ÷ 9 = _____
3. 72 ÷ 8 = _____
4. 60 ÷ 6 = _____
5. 100 ÷ 10 = _____
6. 90 ÷ 5 = _____
7. 144 ÷ 12 = _____
8. 200 ÷ 20 = _____
9. 360 ÷ 9 = _____
10. 500 ÷ 10 = _____
11. 640 ÷ 8 = _____
12. 120 ÷ 4 = _____
13. 180 ÷ 6 = _____
14. 420 ÷ 7 = _____
15. 225 ÷ 5 = _____
16. 360 ÷ 12 = _____
17. 800 ÷ 40 = _____
18. 960 ÷ 12 = _____
19. 720 ÷ 9 = _____
20. 1000 ÷ 25 = _____

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Fractions

1. Half of 20 = _____
2. Half of 50 = _____
3. One-fourth of 40 = _____
4. One-fourth of 80 = _____
5. One-third of 27 = _____
6. One-third of 36 = _____
7. Three-fourths of 20 = _____
8. Three-fourths of 40 = _____
9. One-fifth of 50 = _____
10. One-fifth of 100 = _____
11. Two-thirds of 30 = _____
12. Two-thirds of 60 = _____
13. Half of 120 = _____
14. One-fourth of 200 = _____
15. Three-fourths of 100 = _____

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Decimals

1. 2.5 + 1.5 = _____
2. 3.2 + 4.8 = _____
3. 10.5 − 2.5 = _____
4. 8.6 − 3.6 = _____
5. 0.5 + 0.5 = _____
6. 1.2 + 2.8 = _____
7. 5.5 − 2.5 = _____
8. 9.9 + 0.1 = _____
9. 7.5 + 1.5 = _____
10. 6.4 − 1.4 = _____

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Percentages

1. 10% of 100 = _____
2. 50% of 80 = _____
3. 25% of 40 = _____
4. 20% of 50 = _____
5. 10% of 250 = _____
6. 50% of 120 = _____
7. 25% of 200 = _____
8. 20% of 150 = _____
9. 10% of 500 = _____
10. 50% of 300 = _____

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Word Problems

1. Riya has 25 pencils and buys 15 more. How many pencils does she have now?
2. A shop sold 80 chocolates in the morning and 20 in the evening. How many chocolates were sold altogether?
3. A bus carried 60 passengers. 15 got off. How many passengers remained?
4. There are 12 boxes with 10 apples in each box. How many apples are there?
5. A teacher distributed 100 notebooks equally among 20 students. How many notebooks did each student get?
6. A rope is 80 metres long. 25 metres are cut off. How much rope remains?
7. A cricket team scored 150 runs in one match and 175 runs in another. What was the total score?
8. A farmer has 200 mangoes and packs them equally into 10 baskets. How many mangoes are in each basket?
9. A water tank contains 500 litres of water. If 150 litres are used, how much water is left?
10. A library has 300 books. It buys 75 more books. How many books does it have now?

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Mixed Challenge Round

1. 99 + 1 = _____
2. 100 − 1 = _____
3. 25 × 8 = _____
4. 144 ÷ 12 = _____
5. Half of 300 = _____
6. 20% of 200 = _____
7. 75 + 25 = _____
8. 50 × 20 = _____
9. 1000 ÷ 50 = _____
10. 25% of 80 = _____
11. 18 × 5 = _____
12. 450 ÷ 9 = _____
13. 360 + 140 = _____
14. 800 − 300 = _____
15. Three-fourths of 80 = _____
16. 999 + 999 = _____
17. 1000 − 999 = _____
18. 15 × 12 = _____
19. 720 ÷ 8 = _____
20. 50% of 500 = _____

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Answer Key

Mental Maths for Class 6 – Answer Key (Compact Table)

Q. No.	Addition	Subtraction	Multiplication	Division
1	59	50	40	8
2	75	55	63	9
3	82	44	60	9
4	100	55	60	10
5	85	58	100	10
6	90	100	121	18
7	80	180	300	12
8	100	250	300	10
9	69	400	144	40
10	100	500	225	50
11	149	500	900	80
12	360	500	140	30
13	300	450	65	30
14	600	275	90	60
15	800	500	480	45
16	600	325	225	30
17	500	500	400	20
18	800	750	900	80
19	500	475	88	80
20	1000	400	95	40

Fractions Answers

Q. No.	Answer
1	10
2	25
3	10
4	20
5	9
6	12
7	15
8	30
9	10
10	20
11	20
12	40
13	60
14	50
15	75

Decimals Answers

Q. No.	Answer
1	4.0
2	8.0
3	8.0
4	5.0
5	1.0
6	4.0
7	3.0
8	10.0
9	9.0
10	5.0

Percentages Answers

Q. No.	Answer
1	10
2	40
3	10
4	10
5	25
6	60
7	50
8	30
9	50
10	150

Word Problems Answers

Q. No.	Answer
1	40 pencils
2	100 chocolates
3	45 passengers
4	120 apples
5	5 notebooks
6	55 metres
7	325 runs
8	20 mangoes
9	350 litres
10	375 books

Mixed Challenge Answers

Q. No.	Answer
1	100
2	99
3	200
4	12
5	150
6	40
7	100
8	1000
9	20
10	20
11	90
12	50
13	500
14	500
15	60
16	1998
17	1
18	180
19	90
20	250