Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 112 · 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.Take 890. Reverse its digits and take the smaller number away from the bigger one. What do you get?
2. 2.I thought of a number, added 5 and then doubled it. I got 34. What was my number?
3. 3.41 × ? = 4100
4. 4.630 × 10 =
5. 5.1 × 9 =
6. 6.Take 86 and take away the sum of its digits. What do you get?
7. 7.617 × 10 =
8. 8.1 + 2 + 3 + … + 11 =
9. 9.Magic square (every row, column and diagonal has the same total): 14 15 ? | 9 13 17 | 16 11 12. What is the missing number?
10. 10.666 × 10 =
11. 11.12 × 4 =
12. 12.Do the 1089 trick with 925: reverse and subtract, then reverse that answer and add. What do you get?
13. 13.1 + 2 + 3 + … + 92 =
14. 14.9 × 1000 =
15. 15.Take 650. Reverse its digits and take the smaller number away from the bigger one. What do you get?
16. 16.71?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
17. 17.12 × 9 + 3 =
18. 18.9 × 8 =
19. 19.9 × 9 = ?1 — what is the missing digit?
20. 20.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
21. 21.Magic square (every row, column and diagonal has the same total): 9 14 ? | 16 12 8 | 11 10 15. What is the missing number?
22. 22.Double 81 =
23. 23.The 7th of a month is a Thursday. What day is the 26th of the same month? (a) Tuesday (b) Friday (c) Monday (d) Wednesday
24. 24.702 × 10 =
25. 25.1 + 3 + 5 + … + 41 =
26. 26.37 × 15 =
27. 27.Magic square (every row, column and diagonal has the same total): 15 30 9 | 12 ? 24 | 27 6 21. What is the missing number?
28. 28.Half of 174 =
29. 29.Magic square (every row, column and diagonal has the same total): 25 4 19 | 10 ? 22 | 13 28 7. What is the missing number?
30. 30.9 × 7 =
31. 31.3 × 9 =
32. 32.79 × ? = 7900
33. 33.9 × 2 = 1? — what is the missing digit?
34. 34.9 × 8 = ?2 — what is the missing digit?
35. 35.The 1st of a month is a Friday. What day is the 16th of the same month? (a) Sunday (b) Saturday (c) Tuesday (d) Friday
36. 36.1 + 2 + 3 + … + 86 =
37. 37.Do the 1089 trick with 129: reverse and subtract, then reverse that answer and add. What do you get?
38. 38.A father is 34 years old and his son is 8. How old was the father when the son was born?
39. 39.9 × 3 = 2? — what is the missing digit?
40. 40.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?

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