Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 407 · 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.What comes next? 9, 16, 25, 36, ? (a) 47 (b) 49 (c) 50 (d) 51
2. 2.1 + 3 + 5 + … + 21 =
3. 3.9 × 6 = 5? — what is the missing digit?
4. 4.Take 15 and take away the sum of its digits. What do you get?
5. 5.8 × ? = 800
6. 6.Double 13 =
7. 7.1 + 3 + 5 + … + 43 =
8. 8.35 × 1000 =
9. 9.?544 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
10. 10.9 × 8 = ?2 — what is the missing digit?
11. 11.12 × 9 + 3 =
12. 12.6?16 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
13. 13.121 × ? = 1210
14. 14.The 1st of a month is a Friday. What day is the 30th of the same month? (a) Saturday (b) Sunday (c) Tuesday (d) Friday
15. 15.What comes next? 11, 17, 23, 29, ? (a) 41 (b) 36 (c) 35 (d) 29
16. 16.Take 27 and take away the sum of its digits. What do you get?
17. 17.8 × 4 =
18. 18.The ages of two twins add up to 30. How old is each twin?
19. 19.13 × ? = 13000
20. 20.Half of 96 =
21. 21.?138 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
22. 22.Think of 3. Multiply it by 2, then add 1. What number do you end with?
23. 23.16 × 1000 =
24. 24.If today is Sunday, what day was it 49 days ago? (a) Wednesday (b) Saturday (c) Monday (d) Sunday
25. 25.12 × 4 =
26. 26.1 + 2 + 3 + … + 98 =
27. 27.Think of 5. Multiply it by 3, then add 3. What number do you end with?
28. 28.8 × 9 =
29. 29.I thought of a number, multiplied it by 2 and added 5. I got 15. What was my number?
30. 30.297 + 792 =
31. 31.321 × 10 =
32. 32.47 × 4 =
33. 33.If today is Monday, what day was it 57 days ago? (a) Monday (b) Saturday (c) Sunday (d) Wednesday
34. 34.If today is Tuesday, what day will it be after 90 days? (a) Tuesday (b) Thursday (c) Sunday (d) Monday
35. 35.17 × 4 =
36. 36.497 × 10 =
37. 37.Magic square (every row, column and diagonal has the same total): 11 18 13 | 16 14 12 | 15 10 ?. What is the missing number?
38. 38.3 × 9 =
39. 39.Magic trick! Think of 11. Double it, add 8, halve it, then take away 11. What number do you get?
40. 40.Magic square (every row, column and diagonal has the same total): 11 25 15 | 21 17 ? | 19 9 23. What is the missing number?

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