Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 880 · 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 square (every row, column and diagonal has the same total): 16 ? 20 | 18 14 10 | 8 22 12. What is the missing number?
2. 2.52 × 4 =
3. 3.If today is Friday, what day will it be after 53 days? (a) Tuesday (b) Monday (c) Wednesday (d) Friday
4. 4.9 × 6 = 5? — what is the missing digit?
5. 5.123456789 × 8 + 9 =
6. 6.25 × 4 =
7. 7.9 × 4 = 3? — what is the missing digit?
8. 8.9 × 5 = ?5 — what is the missing digit?
9. 9.28 × 4 =
10. 10.Do the 1089 trick with 228: reverse and subtract, then reverse that answer and add. What do you get?
11. 11.92 × ? = 9200
12. 12.I thought of a number, multiplied it by 4 and added 7. I got 19. What was my number?
13. 13.1 + 2 + 3 + … + 30 =
14. 14.?025 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
15. 15.Take 19 and take away the sum of its digits. What do you get?
16. 16.Double 91 =
17. 17.Magic square (every row, column and diagonal has the same total): 14 15 ? | 9 13 17 | 16 11 12. What is the missing number?
18. 18.7 × 9 =
19. 19.42 × 1000 =
20. 20.Magic square (every row, column and diagonal has the same total): 5 19 9 | 15 11 7 | ? 3 17. What is the missing number?
21. 21.38 × 4 =
22. 22.54 × 4 =
23. 23.Magic square (every row, column and diagonal has the same total): 17 12 13 | ? 14 18 | 15 16 11. What is the missing number?
24. 24.Take 601. Reverse its digits and take the smaller number away from the bigger one. What do you get?
25. 25.I thought of a number, added 6 and then doubled it. I got 50. What was my number?
26. 26.A father is 31 years old and his son is 10. How old was the father when the son was born?
27. 27.56 × 4 =
28. 28.1 + 3 + 5 + … + 9 =
29. 29.A girl is 6 years old and her brother is 4 years older. How old will her brother be in 2 years?
30. 30.9 × 9 =
31. 31.1 + 2 + 3 + … + 23 =
32. 32.11 × 4 =
33. 33.What comes next? 15, 20, 25, 30, ? (a) 30 (b) 36 (c) 35 (d) 40
34. 34.9 × 9 = ?1 — what is the missing digit?
35. 35.3 × 9 =
36. 36.What comes next? 8, 12, 16, 20, ? (a) 25 (b) 24 (c) 20 (d) 28
37. 37.What comes next? 9, 16, 25, 36, ? (a) 51 (b) 50 (c) 49 (d) 47
38. 38.Magic square (every row, column and diagonal has the same total): 20 22 12 | ? 18 26 | 24 14 16. What is the missing number?
39. 39.Magic trick! Think of 17. Double it, add 4, halve it, then take away 17. What number do you get?
40. 40.1 + 2 + 3 + … + 38 =

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