Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 93 · 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 23 × 16 = 368 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 321 + 535 = 862 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 17 × 35 = 595 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 15 × 70 = 1048 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 21 × 83 = 1743 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 15 × 14 = 210 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 68 × 77 = 5236 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 791 + 260 = 1056 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 66 × 53 = 3498 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 346 + 285 = 631 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 27 × 38 = 1034 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 186 + 596 = 782 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 122 + 485 = 612 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 500 + 552 = 1052 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 29 × 22 = 631 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 623 + 804 = 1429 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 666 + 555 = 1221 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 49 × 57 = 2794 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 712 + 199 = 913 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 66 × 87 = 5742 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 442 + 933 = 1372 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 14 × 42 = 580 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 44 × 73 = 3204 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 165 + 816 = 981 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 40 × 58 = 2320 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 281 + 182 = 465 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 81 × 36 = 2922 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 55 × 35 = 1925 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 682 + 128 = 818 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 65 × 98 = 6370 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 845 + 887 = 1732 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 359 + 458 = 819 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 919 + 355 = 1281 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 20 × 65 = 1303 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 81 × 94 = 7614 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 83 × 32 = 2664 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 484 + 543 = 1027 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 21 × 58 = 1218 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 71 × 87 = 6177 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 930 + 291 = 1226 right or wrong? (a) Right (b) Wrong

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