Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 214 · 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. 1.7 × 9 =
2. 2.36 × 10 =
3. 3.9 × 9 =
4. 4.18 × 4 =
5. 5.9 × 3 = ?7 — what is the missing digit?
6. 6.Do the 1089 trick with 360: reverse and subtract, then reverse that answer and add. What do you get?
7. 7.A piggy bank has 5 coins of ₹5 and 4 coins of ₹2. How many rupees are in it?
8. 8.1 + 2 + 3 + … + 19 =
9. 9.12345678 × 8 + 8 =
10. 10.48 × 4 =
11. 11.3?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
12. 12.9 × 6 =
13. 13.51 × 4 =
14. 14.24 × 1000 =
15. 15.The ages of two twins add up to 30. How old is each twin?
16. 16.The 6th of a month is a Sunday. What day is the 20th of the same month? (a) Wednesday (b) Monday (c) Sunday (d) Saturday
17. 17.2?16 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
18. 18.37 × 24 =
19. 19.A father is 39 years old and his son is 8. How old was the father when the son was born?
20. 20.What comes next? 9, 13, 17, 21, ? (a) 26 (b) 21 (c) 25 (d) 29
21. 21.Magic square (every row, column and diagonal has the same total): 13 8 15 | 14 12 10 | ? 16 11. What is the missing number?
22. 22.464? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
23. 23.Double 23 =
24. 24.11 × 11 =
25. 25.12 × 9 + 3 =
26. 26.28 × 100 =
27. 27.If today is Thursday, what day was it 9 days ago? (a) Friday (b) Monday (c) Tuesday (d) Wednesday
28. 28.Magic trick! Think of 20. Double it, add 6, halve it, then take away 20. What number do you get?
29. 29.1 + 2 + 3 + … + 34 =
30. 30.A girl is 5 years old and her brother is 2 years older. How old will her brother be in 4 years?
31. 31.You have 7 coins. Each coin is ₹1 or ₹2, and together they make ₹11. How many ₹2 coins do you have?
32. 32.What comes next? 4, 10, 16, 22, ? (a) 29 (b) 28 (c) 34 (d) 22
33. 33.21 × 4 =
34. 34.9 × 4 = ?6 — what is the missing digit?
35. 35.59 × 100 =
36. 36.What comes next? 4, 9, 16, 25, ? (a) 38 (b) 37 (c) 34 (d) 36
37. 37.A father is 36 years old and his son is 6. How old was the father when the son was born?
38. 38.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
39. 39.1 + 3 + 5 + … + 37 =
40. 40.A father is 35 years old and his son is 7. How old was the father when the son was born?

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