Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 937 · 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 98 and take away the sum of its digits. What do you get?
2. 2.If today is Wednesday, what day was it 24 days ago? (a) Saturday (b) Monday (c) Wednesday (d) Sunday
3. 3.Double 49 =
4. 4.9 × 2 =
5. 5.I thought of a number, added 1 and then doubled it. I got 34. What was my number?
6. 6.Magic square (every row, column and diagonal has the same total): 25 11 21 | 15 19 23 | ? 27 13. What is the missing number?
7. 7.1 + 3 + 5 + … + 35 =
8. 8.Take 44 and take away the sum of its digits. What do you get?
9. 9.Do the 1089 trick with 930: reverse and subtract, then reverse that answer and add. What do you get?
10. 10.What comes next? 25, 36, 49, 64, ? (a) 79 (b) 81 (c) 83 (d) 82
11. 11.Do the 1089 trick with 891: reverse and subtract, then reverse that answer and add. What do you get?
12. 12.11 × 4 =
13. 13.26 × ? = 26000
14. 14.What comes next? 3, 6, 12, 24, ? (a) 36 (b) 49 (c) 42 (d) 48
15. 15.If today is Thursday, what day was it 31 days ago? (a) Tuesday (b) Sunday (c) Thursday (d) Monday
16. 16.12345678 × 9 + 9 =
17. 17.Think of 9. Multiply it by 4, then add 9. What number do you end with?
18. 18.Half of 88 =
19. 19.Magic square (every row, column and diagonal has the same total): 23 26 11 | 8 ? 32 | 29 14 17. What is the missing number?
20. 20.Take 440. Reverse its digits and take the smaller number away from the bigger one. What do you get?
21. 21.What comes next? 13, 21, 29, 37, ? (a) 46 (b) 37 (c) 53 (d) 45
22. 22.1234 × 9 + 5 =
23. 23.9 × 4 =
24. 24.The ages of two twins add up to 14. How old is each twin?
25. 25.12345 × 9 + 6 =
26. 26.8 × 9 =
27. 27.9 × 10 = 9? — what is the missing digit?
28. 28.943 × 10 =
29. 29.41 × 4 =
30. 30.A father is 43 years old and his son is 6. How old was the father when the son was born?
31. 31.If today is Saturday, what day was it 20 days ago? (a) Wednesday (b) Monday (c) Sunday (d) Saturday
32. 32.36 × 4 =
33. 33.The 3rd of a month is a Tuesday. What day is the 14th of the same month? (a) Saturday (b) Sunday (c) Friday (d) Tuesday
34. 34.The 7th of a month is a Wednesday. What day is the 22nd of the same month? (a) Friday (b) Sunday (c) Wednesday (d) Thursday
35. 35.The 2nd of a month is a Sunday. What day is the 11th of the same month? (a) Friday (b) Tuesday (c) Monday (d) Wednesday
36. 36.Odd one out: which number is NOT in the 5 times table? (a) 15 (b) 20 (c) 35 (d) 13
37. 37.38 × 4 =
38. 38.9 × 9 =
39. 39.12345679 × 81 =
40. 40.Magic trick! Think of 12. Double it, add 8, halve it, then take away 12. What number do you get?

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