Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 417 · 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.What comes next? 1, 4, 9, 16, ? (a) 26 (b) 25 (c) 27 (d) 23
2. 2.1?49 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
3. 3.Magic square (every row, column and diagonal has the same total): ? 10 15 | 16 12 8 | 9 14 13. What is the missing number?
4. 4.21 × 100 =
5. 5.Take 65 and take away the sum of its digits. What do you get?
6. 6.730? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
7. 7.Take 216. Reverse its digits and take the smaller number away from the bigger one. What do you get?
8. 8.Take 842. Reverse its digits and take the smaller number away from the bigger one. What do you get?
9. 9.1 + 2 + 3 + … + 99 =
10. 10.12345679 × 27 =
11. 11.396 + 693 =
12. 12.9 × 4 =
13. 13.12345679 × 9 =
14. 14.9 × 5 =
15. 15.12345679 × 72 =
16. 16.1 + 2 + 3 + … + 7 =
17. 17.891 + 198 =
18. 18.9 × 6 = 5? — what is the missing digit?
19. 19.Take 16 and take away the sum of its digits. What do you get?
20. 20.The 7th of a month is a Tuesday. What day is the 15th of the same month? (a) Wednesday (b) Tuesday (c) Thursday (d) Saturday
21. 21.Half of 78 =
22. 22.What comes next? 3, 6, 12, 24, ? (a) 36 (b) 42 (c) 49 (d) 48
23. 23.1 + 2 + 3 + … + 41 =
24. 24.9 × 2 = ?8 — what is the missing digit?
25. 25.What comes next? 3, 9, 15, 21, ? (a) 28 (b) 33 (c) 21 (d) 27
26. 26.Take 86 and take away the sum of its digits. What do you get?
27. 27.1 + 2 + 3 + … + 73 =
28. 28.Take 34 and take away the sum of its digits. What do you get?
29. 29.111111 × 111111 =
30. 30.11 × 4 =
31. 31.2 × 100 =
32. 32.1 + 3 + 5 + … + 35 =
33. 33.1 + 2 + 3 + … + 46 =
34. 34.A father is 31 years old and his son is 11. How old was the father when the son was born?
35. 35.9 × 6 =
36. 36.12 × 4 =
37. 37.Think of 10. Multiply it by 4, then add 2. What number do you end with?
38. 38.Magic square (every row, column and diagonal has the same total): 16 11 ? | 9 13 17 | 14 15 10. What is the missing number?
39. 39.Magic trick! Think of 15. Double it, add 10, halve it, then take away 15. What number do you get?
40. 40.8 × 9 =

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