Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 771 · 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.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
2. 2.1 + 3 + 5 + … + 45 =
3. 3.Odd one out: which number is NOT in the 7 times table? (a) 49 (b) 68 (c) 14 (d) 28
4. 4.Take 167. Reverse its digits and take the smaller number away from the bigger one. What do you get?
5. 5.9 × 6 =
6. 6.If today is Tuesday, what day will it be after 94 days? (a) Friday (b) Monday (c) Thursday (d) Saturday
7. 7.I thought of a number, added 5 and then doubled it. I got 46. What was my number?
8. 8.9 × 9 =
9. 9.The ages of two twins add up to 28. How old is each twin?
10. 10.What comes next? 2, 4, 8, 16, ? (a) 28 (b) 33 (c) 32 (d) 24
11. 11.8 × 1000 =
12. 12.50 × 4 =
13. 13.902 × ? = 9020
14. 14.A girl is 5 years old and her brother is 5 years older. How old will her brother be in 4 years?
15. 15.56 × 4 =
16. 16.Take 391. Reverse its digits and take the smaller number away from the bigger one. What do you get?
17. 17.9 × 8 =
18. 18.The 7th of a month is a Wednesday. What day is the 24th of the same month? (a) Sunday (b) Saturday (c) Tuesday (d) Friday
19. 19.37 × 9 =
20. 20.Think of 4. Multiply it by 4, then add 6. What number do you end with?
21. 21.Magic square (every row, column and diagonal has the same total): 11 12 7 | 6 10 14 | ? 8 9. What is the missing number?
22. 22.Half of 56 =
23. 23.12345679 × 9 =
24. 24.If today is Sunday, what day will it be after 15 days? (a) Monday (b) Tuesday (c) Sunday (d) Thursday
25. 25.Take 117. Reverse its digits and take the smaller number away from the bigger one. What do you get?
26. 26.1 + 2 + 3 + … + 96 =
27. 27.In 2 years a boy will be 15 years old. How old was he 2 years ago?
28. 28.3?70 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
29. 29.161 × ? = 1610
30. 30.Double 85 =
31. 31.What comes next? 4, 8, 16, 32, ? (a) 64 (b) 65 (c) 48 (d) 56
32. 32.11 × 11 =
33. 33.Half of 44 =
34. 34.431 × 10 =
35. 35.Double 54 =
36. 36.53 × 4 =
37. 37.Do the 1089 trick with 470: reverse and subtract, then reverse that answer and add. What do you get?
38. 38.111 × 111 =
39. 39.If today is Monday, what day will it be after 82 days? (a) Sunday (b) Friday (c) Saturday (d) Tuesday
40. 40.9 × 9 = ?1 — what is the missing digit?

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