Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 991 · 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. 1.3 × 9 =
2. 2.Half of 158 =
3. 3.Magic square (every row, column and diagonal has the same total): 12 33 ? | 27 21 15 | 24 9 30. What is the missing number?
4. 4.891 + 198 =
5. 5.9 × 2 = ?8 — what is the missing digit?
6. 6.Odd one out: which number is NOT in the 3 times table? (a) 24 (b) 23 (c) 12 (d) 15
7. 7.934 × 10 =
8. 8.Magic square (every row, column and diagonal has the same total): 16 11 12 | 9 13 ? | 14 15 10. What is the missing number?
9. 9.Take 129. Reverse its digits and take the smaller number away from the bigger one. What do you get?
10. 10.25 × 4 =
11. 11.1 + 2 + 3 + … + 35 =
12. 12.9 × 9 =
13. 13.Half of 68 =
14. 14.34 × 4 =
15. 15.37 × 3 =
16. 16.The 5th of a month is a Sunday. What day is the 29th of the same month? (a) Saturday (b) Tuesday (c) Wednesday (d) Thursday
17. 17.A girl is 8 years old and her brother is 4 years older. How old will her brother be in 4 years?
18. 18.15 × 4 =
19. 19.Do the 1089 trick with 771: reverse and subtract, then reverse that answer and add. What do you get?
20. 20.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
21. 21.A father is 35 years old and his son is 11. How old was the father when the son was born?
22. 22.35 × ? = 35000
23. 23.What comes next? 4, 9, 16, 25, ? (a) 38 (b) 36 (c) 34 (d) 37
24. 24.56 × 4 =
25. 25.Take 412. Reverse its digits and take the smaller number away from the bigger one. What do you get?
26. 26.9 × 8 = ?2 — what is the missing digit?
27. 27.The 3rd of a month is a Saturday. What day is the 22nd of the same month? (a) Wednesday (b) Sunday (c) Friday (d) Thursday
28. 28.What comes next? 1, 2, 4, 8, ? (a) 14 (b) 16 (c) 17 (d) 12
29. 29.Magic trick! Think of 16. Double it, add 6, halve it, then take away 16. What number do you get?
30. 30.Take 910. Reverse its digits and take the smaller number away from the bigger one. What do you get?
31. 31.Magic trick! Think of 4. Double it, add 6, halve it, then take away 4. What number do you get?
32. 32.9 × 1 =
33. 33.The ages of two twins add up to 14. How old is each twin?
34. 34.1234 × 8 + 4 =
35. 35.What comes next? 2, 4, 8, 16, ? (a) 24 (b) 33 (c) 28 (d) 32
36. 36.60 × 4 =
37. 37.Half of 166 =
38. 38.The 8th of a month is a Sunday. What day is the 17th of the same month? (a) Monday (b) Wednesday (c) Friday (d) Tuesday
39. 39.22 × 4 =
40. 40.594 + 495 =

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