Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 163 · 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.In 6 years a boy will be 14 years old. How old was he 4 years ago?
2. 2.A father is 31 years old and his son is 12. How old was the father when the son was born?
3. 3.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
4. 4.Double 41 =
5. 5.Double 32 =
6. 6.A piggy bank has 6 coins of ₹5 and 15 coins of ₹2. How many rupees are in it?
7. 7.37 × 21 =
8. 8.52 × 4 =
9. 9.9 × 10 =
10. 10.The ages of two twins add up to 18. How old is each twin?
11. 11.40 × 4 =
12. 12.11 × 11 =
13. 13.18 × 4 =
14. 14.74 × 100 =
15. 15.Magic square (every row, column and diagonal has the same total): 13 ? 9 | 6 10 14 | 11 12 7. What is the missing number?
16. 16.1 + 2 + 3 + … + 36 =
17. 17.1 + 3 + 5 + … + 31 =
18. 18.Take 199. Reverse its digits and take the smaller number away from the bigger one. What do you get?
19. 19.783 × 10 =
20. 20.123456 × 8 + 6 =
21. 21.44 × 4 =
22. 22.37 × 6 =
23. 23.56 × 4 =
24. 24.495 + 594 =
25. 25.I thought of a number, added 2 and then doubled it. I got 36. What was my number?
26. 26.12345678 × 8 + 8 =
27. 27.A piggy bank has 9 coins of ₹5 and 9 coins of ₹2. How many rupees are in it?
28. 28.A father is 41 years old and his son is 9. How old was the father when the son was born?
29. 29.19 × 1000 =
30. 30.15 × 4 =
31. 31.1111 × 1111 =
32. 32.Take 69 and take away the sum of its digits. What do you get?
33. 33.Magic square (every row, column and diagonal has the same total): 17 19 9 | 7 ? 23 | 21 11 13. What is the missing number?
34. 34.11 × ? = 11000
35. 35.Magic square (every row, column and diagonal has the same total): 16 2 12 | 6 10 14 | ? 18 4. What is the missing number?
36. 36.Half of 94 =
37. 37.531 × 10 =
38. 38.46?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
39. 39.1 + 2 + 3 + … + 15 =
40. 40.Magic square (every row, column and diagonal has the same total): 2 9 ? | 7 5 3 | 6 1 8. What is the missing number?

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