Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 232 · 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. 1.62 × 100 =
2. 2.Think of 8. Multiply it by 5, then add 8. What number do you end with?
3. 3.What comes next? 4, 8, 16, 32, ? (a) 65 (b) 56 (c) 64 (d) 48
4. 4.Think of 4. Multiply it by 3, then add 4. What number do you end with?
5. 5.Double 61 =
6. 6.9 × 9 = 8? — what is the missing digit?
7. 7.Odd one out: which number is NOT in the 4 times table? (a) 24 (b) 34 (c) 12 (d) 28
8. 8.12345679 × 18 =
9. 9.1 + 3 + 5 + … + 23 =
10. 10.Magic square (every row, column and diagonal has the same total): 9 14 13 | ? 12 8 | 11 10 15. What is the missing number?
11. 11.Half of 34 =
12. 12.11 × 4 =
13. 13.837 × 10 =
14. 14.The 3rd of a month is a Tuesday. What day is the 24th of the same month? (a) Friday (b) Tuesday (c) Monday (d) Wednesday
15. 15.21 × 4 =
16. 16.658 × 10 =
17. 17.?555 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
18. 18.111 × 111 =
19. 19.What comes next? 1, 4, 9, 16, ? (a) 26 (b) 25 (c) 27 (d) 23
20. 20.8 × ? = 8000
21. 21.9 × 3 =
22. 22.4 × 1000 =
23. 23.54 × 100 =
24. 24.Magic square (every row, column and diagonal has the same total): ? 14 9 | 8 12 16 | 15 10 11. What is the missing number?
25. 25.12345679 × 72 =
26. 26.1 + 2 + 3 + … + 85 =
27. 27.I thought of a number, multiplied it by 5 and added 1. I got 61. What was my number?
28. 28.Magic trick! Think of 20. Double it, add 4, halve it, then take away 20. What number do you get?
29. 29.402? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
30. 30.1 + 2 + 3 + … + 6 =
31. 31.Take 980. Reverse its digits and take the smaller number away from the bigger one. What do you get?
32. 32.40 × ? = 4000
33. 33.Double 89 =
34. 34.9 × 8 = 7? — what is the missing digit?
35. 35.Magic trick! Think of 19. Double it, add 10, halve it, then take away 19. What number do you get?
36. 36.37 × 6 =
37. 37.5?19 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
38. 38.4?97 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
39. 39.Take 408. Reverse its digits and take the smaller number away from the bigger one. What do you get?
40. 40.48 × 4 =

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