Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 578 · 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.?893 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
2. 2.Take 29 and take away the sum of its digits. What do you get?
3. 3.160? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
4. 4.Take 64 and take away the sum of its digits. What do you get?
5. 5.1?56 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
6. 6.?263 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
7. 7.23?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
8. 8.69? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
9. 9.1?88 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
10. 10.Take 83 and take away the sum of its digits. What do you get?
11. 11.Take 23 and take away the sum of its digits. What do you get?
12. 12.10?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
13. 13.1?64 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
14. 14.71? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
15. 15.23?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
16. 16.Take 32 and take away the sum of its digits. What do you get?
17. 17.50? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
18. 18.?773 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
19. 19.Take 13 and take away the sum of its digits. What do you get?
20. 20.Take 60 and take away the sum of its digits. What do you get?
21. 21.Take 77 and take away the sum of its digits. What do you get?
22. 22.422? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
23. 23.35?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
24. 24.Take 20 and take away the sum of its digits. What do you get?
25. 25.5?13 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
26. 26.147? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
27. 27.Take 38 and take away the sum of its digits. What do you get?
28. 28.Take 79 and take away the sum of its digits. What do you get?
29. 29.Take 76 and take away the sum of its digits. What do you get?
30. 30.?249 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
31. 31.Take 81 and take away the sum of its digits. What do you get?
32. 32.?442 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
33. 33.Take 15 and take away the sum of its digits. What do you get?
34. 34.Take 11 and take away the sum of its digits. What do you get?
35. 35.53?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
36. 36.Take 92 and take away the sum of its digits. What do you get?
37. 37.18?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
38. 38.?070 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
39. 39.Take 58 and take away the sum of its digits. What do you get?
40. 40.?769 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

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