Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 888 · 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): 26 ? 32 | 29 23 17 | 14 35 20. What is the missing number?
2. 2.Double 33 =
3. 3.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
4. 4.Think of 3. Multiply it by 5, then add 8. What number do you end with?
5. 5.10 × ? = 10000
6. 6.Do the 1089 trick with 490: reverse and subtract, then reverse that answer and add. What do you get?
7. 7.A father is 32 years old and his son is 14. How old was the father when the son was born?
8. 8.The 2nd of a month is a Friday. What day is the 20th of the same month? (a) Wednesday (b) Tuesday (c) Monday (d) Friday
9. 9.1 + 2 + 3 + … + 83 =
10. 10.Think of 10. Multiply it by 5, then add 4. What number do you end with?
11. 11.Think of 7. Multiply it by 4, then add 9. What number do you end with?
12. 12.18 × 4 =
13. 13.Magic square (every row, column and diagonal has the same total): ? 20 10 | 8 16 24 | 22 12 14. What is the missing number?
14. 14.In 4 years a boy will be 12 years old. How old was he 4 years ago?
15. 15.What comes next? 5, 13, 21, 29, ? (a) 38 (b) 37 (c) 29 (d) 45
16. 16.25 × 4 =
17. 17.12345 × 9 + 6 =
18. 18.37 × 12 =
19. 19.Take 199. Reverse its digits and take the smaller number away from the bigger one. What do you get?
20. 20.1 + 3 + 5 + … + 27 =
21. 21.9 × 2 =
22. 22.480? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
23. 23.1 + 2 + 3 + … + 62 =
24. 24.Do the 1089 trick with 934: reverse and subtract, then reverse that answer and add. What do you get?
25. 25.9 × 4 =
26. 26.38 × 4 =
27. 27.The 7th of a month is a Tuesday. What day is the 26th of the same month? (a) Wednesday (b) Monday (c) Saturday (d) Sunday
28. 28.I thought of a number, multiplied it by 5 and added 4. I got 14. What was my number?
29. 29.1234567 × 8 + 7 =
30. 30.230 × 10 =
31. 31.What comes next? 5, 10, 20, 40, ? (a) 70 (b) 80 (c) 81 (d) 60
32. 32.9 × 3 = 2? — what is the missing digit?
33. 33.37 × 4 =
34. 34.Half of 166 =
35. 35.Magic trick! Think of 5. Double it, add 4, halve it, then take away 5. What number do you get?
36. 36.What comes next? 1, 2, 4, 8, ? (a) 12 (b) 16 (c) 17 (d) 14
37. 37.123456 × 8 + 6 =
38. 38.60 × 4 =
39. 39.Odd one out: which number is NOT in the 9 times table? (a) 41 (b) 18 (c) 72 (d) 45
40. 40.What comes next? 4, 8, 16, 32, ? (a) 64 (b) 48 (c) 65 (d) 56

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