Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 845 · 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. 1.9 × 3 = 2? — what is the missing digit?
2. 2.323 × 10 =
3. 3.8?48 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
4. 4.1 + 3 + 5 + … + 15 =
5. 5.1 + 2 + 3 + … + 60 =
6. 6.Do the 1089 trick with 114: reverse and subtract, then reverse that answer and add. What do you get?
7. 7.1?89 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
8. 8.4 × 9 =
9. 9.41 × 100 =
10. 10.Half of 72 =
11. 11.Take 940. Reverse its digits and take the smaller number away from the bigger one. What do you get?
12. 12.Take 95 and take away the sum of its digits. What do you get?
13. 13.9 × 7 =
14. 14.221 × 10 =
15. 15.?836 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
16. 16.Magic square (every row, column and diagonal has the same total): 15 5 19 | 17 13 9 | 7 ? 11. What is the missing number?
17. 17.12345678 × 8 + 8 =
18. 18.What comes next? 4, 9, 16, 25, ? (a) 37 (b) 38 (c) 36 (d) 34
19. 19.1 + 2 + 3 + … + 18 =
20. 20.12345678 × 9 + 9 =
21. 21.A father is 35 years old and his son is 13. How old was the father when the son was born?
22. 22.The 3rd of a month is a Monday. What day is the 19th of the same month? (a) Tuesday (b) Wednesday (c) Thursday (d) Saturday
23. 23.9 × 4 = ?6 — what is the missing digit?
24. 24.37 × 3 =
25. 25.42 × 1000 =
26. 26.21 × 100 =
27. 27.1 + 3 + 5 + … + 21 =
28. 28.123 × 8 + 3 =
29. 29.Magic square (every row, column and diagonal has the same total): 12 ? 10 | 7 9 11 | 8 13 6. What is the missing number?
30. 30.What comes next? 16, 19, 22, 25, ? (a) 25 (b) 28 (c) 31 (d) 29
31. 31.1 + 2 + 3 + … + 62 =
32. 32.A girl is 7 years old and her brother is 3 years older. How old will her brother be in 2 years?
33. 33.Magic square (every row, column and diagonal has the same total): 10 11 ? | 5 9 13 | 12 7 8. What is the missing number?
34. 34.58 × 4 =
35. 35.14 × 4 =
36. 36.Think of 11. Multiply it by 4, then add 3. What number do you end with?
37. 37.What comes next? 4, 8, 16, 32, ? (a) 64 (b) 56 (c) 65 (d) 48
38. 38.594 + 495 =
39. 39.11111 × 11111 =
40. 40.123456 × 9 + 7 =

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