Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 808 · 40 questions

The trick (Last digits only): Multiply (or add) only the last digits of the two numbers. The last digit of that result is the last digit the answer must have. Different last digit → wrong for sure. Same last digit → it passes the check (work it out in full to be certain).

1. 1.Last-digit check: is 986 + 118 = 1104 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 16 × 76 = 1208 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 96 × 36 = 3456 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 17 × 57 = 964 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 95 × 33 = 3135 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 869 + 152 = 1021 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 367 + 512 = 879 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 74 × 13 = 962 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 23 × 91 = 2093 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 307 + 136 = 443 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 64 × 83 = 5312 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 19 × 35 = 674 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 784 + 652 = 1436 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 936 + 264 = 1198 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 97 × 99 = 9603 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 77 × 69 = 5315 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 21 × 27 = 565 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 56 × 69 = 3864 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 18 × 23 = 418 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 76 × 93 = 7068 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 733 + 428 = 1155 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 22 × 22 = 487 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 344 + 757 = 1101 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 90 × 67 = 6021 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 792 + 917 = 1700 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 540 + 347 = 887 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 97 × 85 = 8245 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 70 × 81 = 5661 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 21 × 76 = 1596 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 244 + 815 = 1059 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 439 + 786 = 1218 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 711 + 925 = 1637 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 356 + 370 = 724 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 920 + 851 = 1773 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 16 × 22 = 352 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 884 + 913 = 1797 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 949 + 337 = 1286 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 38 × 73 = 2767 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 50 × 26 = 1300 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 554 + 365 = 919 right or wrong? (a) Wrong (b) Right

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