Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 161 · 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. 1.55 × 4 =
2. 2.9 × 2 = ?8 — what is the missing digit?
3. 3.Magic square (every row, column and diagonal has the same total): 16 14 24 | 26 18 10 | 12 ? 20. What is the missing number?
4. 4.46 × 4 =
5. 5.If today is Wednesday, what day was it 20 days ago? (a) Friday (b) Thursday (c) Wednesday (d) Sunday
6. 6.654 × 10 =
7. 7.1 + 3 + 5 + … + 21 =
8. 8.9 × 9 = 8? — what is the missing digit?
9. 9.Double 12 =
10. 10.I thought of a number, multiplied it by 3 and added 8. I got 53. What was my number?
11. 11.Double 82 =
12. 12.The 8th of a month is a Tuesday. What day is the 18th of the same month? (a) Thursday (b) Monday (c) Friday (d) Saturday
13. 13.495 + 594 =
14. 14.Magic square (every row, column and diagonal has the same total): 14 7 12 | 9 ? 13 | 10 15 8. What is the missing number?
15. 15.9 × 4 =
16. 16.27 × 4 =
17. 17.37 × 24 =
18. 18.Magic trick! Think of 20. Double it, add 16, halve it, then take away 20. What number do you get?
19. 19.71 × 10 =
20. 20.Take 99 and take away the sum of its digits. What do you get?
21. 21.?575 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
22. 22.Take 274. Reverse its digits and take the smaller number away from the bigger one. What do you get?
23. 23.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
24. 24.36 × 4 =
25. 25.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
26. 26.Magic square (every row, column and diagonal has the same total): ? 9 16 | 15 13 11 | 10 17 12. What is the missing number?
27. 27.1 + 2 + 3 + … + 69 =
28. 28.9 × 5 = 4? — what is the missing digit?
29. 29.2 × 9 =
30. 30.The ages of two twins add up to 24. How old is each twin?
31. 31.19 × 4 =
32. 32.230 × 10 =
33. 33.What comes next? 5, 10, 20, 40, ? (a) 70 (b) 80 (c) 81 (d) 60
34. 34.9 × 9 = ?1 — what is the missing digit?
35. 35.Take 13 and take away the sum of its digits. What do you get?
36. 36.In 5 years a boy will be 19 years old. How old was he 7 years ago?
37. 37.11 × 11 =
38. 38.What comes next? 4, 12, 20, 28, ? (a) 44 (b) 36 (c) 37 (d) 28
39. 39.76 × 100 =
40. 40.If today is Saturday, what day will it be after 12 days? (a) Sunday (b) Friday (c) Wednesday (d) Thursday

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