Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 812 · 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. 1.58 × 4 =
2. 2.9 × 4 =
3. 3.52 × 4 =
4. 4.626 × ? = 6260
5. 5.Half of 106 =
6. 6.41 × 1000 =
7. 7.9 × 7 = ?3 — what is the missing digit?
8. 8.Take 910. Reverse its digits and take the smaller number away from the bigger one. What do you get?
9. 9.What comes next? 9, 16, 25, 36, ? (a) 50 (b) 51 (c) 47 (d) 49
10. 10.16 × ? = 16000
11. 11.9 × 9 =
12. 12.Double 49 =
13. 13.9 × 3 = ?7 — what is the missing digit?
14. 14.1 + 2 + 3 + … + 15 =
15. 15.9 × 2 =
16. 16.Magic square (every row, column and diagonal has the same total): 9 ? 7 | 4 6 8 | 5 10 3. What is the missing number?
17. 17.Take 744. Reverse its digits and take the smaller number away from the bigger one. What do you get?
18. 18.2 × 9 =
19. 19.2?58 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
20. 20.47 × 4 =
21. 21.9 × 3 = 2? — what is the missing digit?
22. 22.If today is Thursday, what day was it 39 days ago? (a) Monday (b) Saturday (c) Wednesday (d) Sunday
23. 23.9 × 8 = 7? — what is the missing digit?
24. 24.21 × 100 =
25. 25.Take 32 and take away the sum of its digits. What do you get?
26. 26.37 × 18 =
27. 27.Think of 8. Multiply it by 5, then add 2. What number do you end with?
28. 28.The 3rd of a month is a Tuesday. What day is the 24th of the same month? (a) Wednesday (b) Monday (c) Friday (d) Tuesday
29. 29.Half of 146 =
30. 30.Magic square (every row, column and diagonal has the same total): 21 7 ? | 11 15 19 | 13 23 9. What is the missing number?
31. 31.The 5th of a month is a Friday. What day is the 15th of the same month? (a) Sunday (b) Thursday (c) Tuesday (d) Monday
32. 32.293 × 10 =
33. 33.I thought of a number, multiplied it by 3 and added 1. I got 7. What was my number?
34. 34.12345679 × 27 =
35. 35.The 3rd of a month is a Sunday. What day is the 11th of the same month? (a) Thursday (b) Monday (c) Tuesday (d) Sunday
36. 36.1 × 9 =
37. 37.12345679 × 72 =
38. 38.Half of 42 =
39. 39.Take 590. Reverse its digits and take the smaller number away from the bigger one. What do you get?
40. 40.1 + 3 + 5 + … + 27 =

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