Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 86 · 40 questions

The trick (Digits add to the 9 table): Add the digits you can see. Find the next number in the 9 table (9, 18, 27 …) above that total. The hidden digit is the difference. (Any number minus its digit sum is in the 9 table too.)

1. 1.?09 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
2. 2.370? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
3. 3.?272 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
4. 4.?433 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
5. 5.Take 28 and take away the sum of its digits. What do you get?
6. 6.Take 24 and take away the sum of its digits. What do you get?
7. 7.?835 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
8. 8.Take 76 and take away the sum of its digits. What do you get?
9. 9.?030 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
10. 10.38?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
11. 11.Take 18 and take away the sum of its digits. What do you get?
12. 12.Take 33 and take away the sum of its digits. What do you get?
13. 13.8?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
14. 14.?579 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
15. 15.Take 77 and take away the sum of its digits. What do you get?
16. 16.553? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
17. 17.Take 82 and take away the sum of its digits. What do you get?
18. 18.60? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
19. 19.161? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
20. 20.70?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
21. 21.Take 22 and take away the sum of its digits. What do you get?
22. 22.Take 81 and take away the sum of its digits. What do you get?
23. 23.Take 89 and take away the sum of its digits. What do you get?
24. 24.Take 74 and take away the sum of its digits. What do you get?
25. 25.Take 75 and take away the sum of its digits. What do you get?
26. 26.50? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
27. 27.?007 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
28. 28.Take 11 and take away the sum of its digits. What do you get?
29. 29.12?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
30. 30.Take 70 and take away the sum of its digits. What do you get?
31. 31.Take 54 and take away the sum of its digits. What do you get?
32. 32.737? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
33. 33.Take 83 and take away the sum of its digits. What do you get?
34. 34.477? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
35. 35.6?50 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
36. 36.789? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
37. 37.Take 61 and take away the sum of its digits. What do you get?
38. 38.?148 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
39. 39.Take 73 and take away the sum of its digits. What do you get?
40. 40.Take 85 and take away the sum of its digits. What do you get?

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