Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 176 · 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 245 + 966 = 1211 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 88 × 63 = 5540 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 609 + 595 = 1204 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 612 + 176 = 790 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 718 + 294 = 1015 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 30 × 55 = 1650 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 730 + 354 = 1091 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 611 + 536 = 1147 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 522 + 517 = 1039 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 97 × 39 = 3783 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 96 × 34 = 3264 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 81 × 99 = 8013 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 906 + 596 = 1511 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 38 × 19 = 722 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 951 + 773 = 1730 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 819 + 608 = 1427 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 36 × 34 = 1224 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 712 + 346 = 1058 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 729 + 361 = 1090 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 29 × 43 = 1247 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 31 × 29 = 899 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 81 × 35 = 2835 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 826 + 508 = 1334 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 32 × 22 = 707 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 347 + 457 = 804 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 36 × 33 = 1188 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 34 × 35 = 1189 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 46 × 52 = 2392 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 48 × 38 = 1824 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 99 × 66 = 6534 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 642 + 105 = 753 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 730 + 326 = 1055 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 322 + 187 = 517 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 27 × 33 = 889 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 272 + 933 = 1198 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 16 × 55 = 880 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 26 × 49 = 1274 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 748 + 690 = 1438 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 93 × 33 = 3074 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 270 + 617 = 887 right or wrong? (a) Wrong (b) Right

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