Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 623 · 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. 1.123456789 × 8 + 9 =
2. 2.9 × 1 =
3. 3.495 + 594 =
4. 4.803? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
5. 5.A girl is 5 years old and her brother is 6 years older. How old will her brother be in 3 years?
6. 6.Half of 196 =
7. 7.Magic square (every row, column and diagonal has the same total): 17 7 21 | 19 15 ? | 9 23 13. What is the missing number?
8. 8.20?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
9. 9.Do the 1089 trick with 765: reverse and subtract, then reverse that answer and add. What do you get?
10. 10.34 × 4 =
11. 11.63 × ? = 6300
12. 12.53 × 4 =
13. 13.I thought of a number, added 8 and then doubled it. I got 24. What was my number?
14. 14.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
15. 15.9 × 2 =
16. 16.5?58 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
17. 17.A father is 31 years old and his son is 12. How old was the father when the son was born?
18. 18.9 × 8 = 7? — what is the missing digit?
19. 19.I thought of a number, added 6 and then doubled it. I got 52. What was my number?
20. 20.20 × 4 =
21. 21.Magic square (every row, column and diagonal has the same total): 6 1 ? | 7 5 3 | 2 9 4. What is the missing number?
22. 22.Magic square (every row, column and diagonal has the same total): 14 35 20 | 29 23 17 | ? 11 32. What is the missing number?
23. 23.Take 920. Reverse its digits and take the smaller number away from the bigger one. What do you get?
24. 24.9 × 4 = ?6 — what is the missing digit?
25. 25.What comes next? 19, 27, 35, 43, ? (a) 59 (b) 43 (c) 51 (d) 52
26. 26.Double 28 =
27. 27.A father is 32 years old and his son is 6. How old was the father when the son was born?
28. 28.Magic square (every row, column and diagonal has the same total): 17 19 ? | 7 15 23 | 21 11 13. What is the missing number?
29. 29.9 × 6 =
30. 30.Take 20 and take away the sum of its digits. What do you get?
31. 31.49 × 4 =
32. 32.54 × 4 =
33. 33.Do the 1089 trick with 361: reverse and subtract, then reverse that answer and add. What do you get?
34. 34.1 + 3 + 5 + … + 21 =
35. 35.You have 14 coins. Each coin is ₹1 or ₹2, and together they make ₹24. How many ₹2 coins do you have?
36. 36.In 2 years a boy will be 11 years old. How old was he 5 years ago?
37. 37.A piggy bank has 12 coins of ₹5 and 5 coins of ₹2. How many rupees are in it?
38. 38.What comes next? 3, 6, 12, 24, ? (a) 48 (b) 36 (c) 42 (d) 49
39. 39.8 × 9 =
40. 40.67 × 100 =

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