Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 281 · 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 33 and take away the sum of its digits. What do you get?
2. 2.What comes next? 1, 2, 4, 8, ? (a) 17 (b) 14 (c) 12 (d) 16
3. 3.You have 8 coins. Each coin is ₹1 or ₹2, and together they make ₹13. How many ₹2 coins do you have?
4. 4.Think of 14. Multiply it by 5, then add 9. What number do you end with?
5. 5.The 5th of a month is a Thursday. What day is the 16th of the same month? (a) Thursday (b) Monday (c) Tuesday (d) Sunday
6. 6.Take 97 and take away the sum of its digits. What do you get?
7. 7.876 × 10 =
8. 8.Take 920. Reverse its digits and take the smaller number away from the bigger one. What do you get?
9. 9.What comes next? 25, 36, 49, 64, ? (a) 79 (b) 81 (c) 83 (d) 82
10. 10.Magic trick! Think of 5. Double it, add 14, halve it, then take away 5. What number do you get?
11. 11.Double 91 =
12. 12.9 × 9 = ?1 — what is the missing digit?
13. 13.9 × 10 = ?0 — what is the missing digit?
14. 14.A girl is 9 years old and her brother is 2 years older. How old will her brother be in 2 years?
15. 15.Magic square (every row, column and diagonal has the same total): 8 ? 6 | 3 5 7 | 4 9 2. What is the missing number?
16. 16.34 × 4 =
17. 17.Half of 16 =
18. 18.9 × 10 =
19. 19.35 × 4 =
20. 20.9 × 10 = 9? — what is the missing digit?
21. 21.89 × 100 =
22. 22.Magic square (every row, column and diagonal has the same total): 18 ? 10 | 8 16 24 | 22 12 14. What is the missing number?
23. 23.I thought of a number, multiplied it by 3 and added 8. I got 35. What was my number?
24. 24.Double 82 =
25. 25.Magic trick! Think of 12. Double it, add 4, halve it, then take away 12. What number do you get?
26. 26.37 × 24 =
27. 27.1 × 9 =
28. 28.8 × 9 =
29. 29.Magic square (every row, column and diagonal has the same total): 17 7 21 | 19 15 11 | ? 23 13. What is the missing number?
30. 30.A father is 30 years old and his son is 14. How old was the father when the son was born?
31. 31.1 + 2 + 3 + … + 58 =
32. 32.1 + 2 + 3 + … + 38 =
33. 33.37 × 4 =
34. 34.Magic square (every row, column and diagonal has the same total): ? 8 13 | 14 10 6 | 7 12 11. What is the missing number?
35. 35.Take 89 and take away the sum of its digits. What do you get?
36. 36.The ages of two twins add up to 14. How old is each twin?
37. 37.9 × 4 = 3? — what is the missing digit?
38. 38.I thought of a number, added 5 and then doubled it. I got 26. What was my number?
39. 39.Magic square (every row, column and diagonal has the same total): 26 5 20 | 11 17 23 | 14 29 ?. What is the missing number?
40. 40.Do the 1089 trick with 880: reverse and subtract, then reverse that answer and add. What do you get?

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