Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 924 · 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.Magic trick! Think of 17. Double it, add 14, halve it, then take away 17. What number do you get?
2. 2.1 × 9 =
3. 3.9 × 4 = ?6 — what is the missing digit?
4. 4.123 × 9 + 4 =
5. 5.9 × 7 =
6. 6.93 × 100 =
7. 7.9 × 3 = ?7 — what is the missing digit?
8. 8.1 + 3 + 5 + … + 25 =
9. 9.?366 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
10. 10.1 + 3 + 5 + … + 21 =
11. 11.1 + 2 + 3 + … + 72 =
12. 12.Magic trick! Think of 11. Double it, add 8, halve it, then take away 11. What number do you get?
13. 13.Half of 168 =
14. 14.What comes next? 4, 9, 14, 19, ? (a) 25 (b) 19 (c) 24 (d) 29
15. 15.Magic square (every row, column and diagonal has the same total): ? 18 33 | 36 24 12 | 15 30 27. What is the missing number?
16. 16.9 × 4 =
17. 17.What comes next? 25, 36, 49, 64, ? (a) 79 (b) 82 (c) 81 (d) 83
18. 18.12345679 × 9 =
19. 19.A father is 39 years old and his son is 10. How old was the father when the son was born?
20. 20.A piggy bank has 9 coins of ₹5 and 11 coins of ₹2. How many rupees are in it?
21. 21.9 × 10 = 9? — what is the missing digit?
22. 22.5 × 9 =
23. 23.1 + 2 + 3 + … + 85 =
24. 24.Magic square (every row, column and diagonal has the same total): 12 11 16 | 17 13 9 | 10 ? 14. What is the missing number?
25. 25.Magic square (every row, column and diagonal has the same total): 18 20 10 | 8 16 ? | 22 12 14. What is the missing number?
26. 26.9 × 6 = 5? — what is the missing digit?
27. 27.12345679 × 27 =
28. 28.A father is 43 years old and his son is 6. How old was the father when the son was born?
29. 29.8 × 9 =
30. 30.65 × 100 =
31. 31.Take 173. Reverse its digits and take the smaller number away from the bigger one. What do you get?
32. 32.Think of 8. Multiply it by 2, then add 5. What number do you end with?
33. 33.7 × 9 =
34. 34.1 + 2 + 3 + … + 30 =
35. 35.What comes next? 3, 6, 12, 24, ? (a) 49 (b) 42 (c) 48 (d) 36
36. 36.29 × 4 =
37. 37.123 × 8 + 3 =
38. 38.Double 54 =
39. 39.1 + 3 + 5 + … + 19 =
40. 40.Think of 4. Multiply it by 3, then add 8. What number do you end with?

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