Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 979 · 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. 1.21 × 4 =
2. 2.8 × 9 =
3. 3.9 × 6 = 5? — what is the missing digit?
4. 4.Double 55 =
5. 5.Double 58 =
6. 6.The 9th of a month is a Friday. What day is the 29th of the same month? (a) Wednesday (b) Thursday (c) Sunday (d) Friday
7. 7.594 + 495 =
8. 8.Magic square (every row, column and diagonal has the same total): 10 11 6 | 5 ? 13 | 12 7 8. What is the missing number?
9. 9.Magic square (every row, column and diagonal has the same total): 18 21 6 | ? 15 27 | 24 9 12. What is the missing number?
10. 10.42 × 100 =
11. 11.Think of 9. Multiply it by 2, then add 3. What number do you end with?
12. 12.Half of 116 =
13. 13.Double 56 =
14. 14.9 × 4 = 3? — what is the missing digit?
15. 15.Take 920. Reverse its digits and take the smaller number away from the bigger one. What do you get?
16. 16.?64 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
17. 17.A father is 42 years old and his son is 13. How old was the father when the son was born?
18. 18.What comes next? 5, 10, 20, 40, ? (a) 70 (b) 81 (c) 80 (d) 60
19. 19.Odd one out: which number is NOT in the 6 times table? (a) 36 (b) 29 (c) 12 (d) 30
20. 20.Magic square (every row, column and diagonal has the same total): 9 4 5 | 2 6 ? | 7 8 3. What is the missing number?
21. 21.Half of 136 =
22. 22.9 × 8 = 7? — what is the missing digit?
23. 23.The 2nd of a month is a Tuesday. What day is the 29th of the same month? (a) Thursday (b) Tuesday (c) Sunday (d) Monday
24. 24.7 × ? = 7000
25. 25.1 + 2 + 3 + … + 51 =
26. 26.1 + 2 + 3 + … + 59 =
27. 27.The 6th of a month is a Tuesday. What day is the 20th of the same month? (a) Tuesday (b) Wednesday (c) Monday (d) Friday
28. 28.40 × 4 =
29. 29.Do the 1089 trick with 611: reverse and subtract, then reverse that answer and add. What do you get?
30. 30.In 4 years a boy will be 14 years old. How old was he 4 years ago?
31. 31.I thought of a number, multiplied it by 5 and added 7. I got 17. What was my number?
32. 32.Take 62 and take away the sum of its digits. What do you get?
33. 33.25 × 4 =
34. 34.39 × 4 =
35. 35.A father is 35 years old and his son is 7. How old was the father when the son was born?
36. 36.9 × 2 = ?8 — what is the missing digit?
37. 37.Take 78 and take away the sum of its digits. What do you get?
38. 38.What comes next? 9, 16, 25, 36, ? (a) 47 (b) 51 (c) 49 (d) 50
39. 39.10 × 9 =
40. 40.A piggy bank has 7 coins of ₹5 and 14 coins of ₹2. How many rupees are in it?

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