Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 311 · 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 820 + 221 = 1041 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 12 × 68 = 815 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 366 + 260 = 620 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 78 × 38 = 2964 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 68 × 93 = 6321 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 580 + 966 = 1544 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 59 × 33 = 1946 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 418 + 421 = 833 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 13 × 82 = 1074 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 14 × 80 = 1120 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 94 × 31 = 2914 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 733 + 956 = 1694 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 17 × 16 = 272 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 37 × 90 = 3330 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 62 × 39 = 2416 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 416 + 409 = 826 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 59 × 15 = 883 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 40 × 19 = 752 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 236 + 531 = 773 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 16 × 79 = 1264 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 692 + 354 = 1046 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 429 + 345 = 774 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 99 × 95 = 9405 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 68 × 51 = 3475 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 145 + 343 = 489 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 654 + 621 = 1275 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 49 × 90 = 4408 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 407 + 477 = 884 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 752 + 185 = 937 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 58 × 88 = 5101 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 22 × 76 = 1672 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 346 + 421 = 769 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 892 + 996 = 1887 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 637 + 764 = 1401 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 394 + 489 = 883 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 89 × 13 = 1149 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 248 + 287 = 535 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 56 × 72 = 4032 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 718 + 745 = 1456 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 26 × 76 = 1969 right or wrong? (a) Right (b) Wrong

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