Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 751 · 40 questions

The trick (Choose a trick): × 9 → finger trick; × 4 → double double; × 10, 100, 1000 → slide and add zeros. 37, 12345679 or 111… → magic patterns; reverse and subtract → 1089. Puzzles: find the rule, the total or the leftover days, then check your answer.

1. 1.1 + 3 + 5 + … + 29 =
2. 2.Half of 132 =
3. 3.7 × 9 =
4. 4.Double 79 =
5. 5.Magic square (every row, column and diagonal has the same total): 18 21 6 | ? 15 27 | 24 9 12. What is the missing number?
6. 6.Magic square (every row, column and diagonal has the same total): 26 11 14 | ? 17 29 | 20 23 8. What is the missing number?
7. 7.Take 71 and take away the sum of its digits. What do you get?
8. 8.If today is Monday, what day will it be after 14 days? (a) Sunday (b) Monday (c) Thursday (d) Tuesday
9. 9.37 × 100 =
10. 10.Magic trick! Think of 17. Double it, add 6, halve it, then take away 17. What number do you get?
11. 11.594 + 495 =
12. 12.31 × ? = 31000
13. 13.43 × 4 =
14. 14.I thought of a number, added 6 and then doubled it. I got 48. What was my number?
15. 15.111111 × 111111 =
16. 16.A piggy bank has 11 coins of ₹5 and 14 coins of ₹2. How many rupees are in it?
17. 17.What comes next? 1, 4, 9, 16, ? (a) 23 (b) 26 (c) 27 (d) 25
18. 18.Think of 5. Multiply it by 4, then add 5. What number do you end with?
19. 19.1 + 2 + 3 + … + 90 =
20. 20.A girl is 11 years old and her brother is 5 years older. How old will her brother be in 2 years?
21. 21.Half of 112 =
22. 22.Half of 72 =
23. 23.I thought of a number, added 9 and then doubled it. I got 42. What was my number?
24. 24.If today is Saturday, what day was it 39 days ago? (a) Friday (b) Monday (c) Tuesday (d) Wednesday
25. 25.What comes next? 36, 49, 64, 81, ? (a) 100 (b) 98 (c) 102 (d) 101
26. 26.1 + 2 + 3 + … + 30 =
27. 27.31 × ? = 310
28. 28.1 + 2 + 3 + … + 16 =
29. 29.22 × ? = 2200
30. 30.Odd one out: which number is NOT in the 8 times table? (a) 64 (b) 48 (c) 32 (d) 47
31. 31.The ages of two twins add up to 8. How old is each twin?
32. 32.Half of 48 =
33. 33.4?69 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
34. 34.1 + 2 + 3 + … + 59 =
35. 35.37 × 21 =
36. 36.Take 32 and take away the sum of its digits. What do you get?
37. 37.97 × 100 =
38. 38.Magic square (every row, column and diagonal has the same total): 9 4 5 | 2 ? 10 | 7 8 3. What is the missing number?
39. 39.Magic square (every row, column and diagonal has the same total): 9 8 13 | 14 10 6 | 7 12 ?. What is the missing number?
40. 40.9 × 4 =

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