Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 425 · 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 96 × 72 = 6920 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 863 + 134 = 997 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 676 + 559 = 1235 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 635 + 273 = 915 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 63 × 33 = 2085 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 32 × 32 = 1015 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 71 × 37 = 2627 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 726 + 201 = 927 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 878 + 194 = 1072 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 114 + 772 = 886 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 25 × 45 = 1125 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 804 + 976 = 1780 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 890 + 538 = 1428 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 71 × 42 = 2982 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 530 + 172 = 700 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 16 × 86 = 1379 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 427 + 303 = 733 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 59 × 29 = 1711 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 814 + 253 = 1069 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 335 + 528 = 868 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 15 × 60 = 900 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 97 × 52 = 5044 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 216 + 193 = 409 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 443 + 848 = 1298 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 147 + 423 = 570 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 595 + 497 = 1092 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 52 × 88 = 4580 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 47 × 69 = 3243 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 999 + 598 = 1597 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 247 + 109 = 353 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 33 × 60 = 1980 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 36 × 84 = 3023 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 383 + 839 = 1217 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 700 + 779 = 1479 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 446 + 276 = 722 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 63 × 95 = 5992 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 54 × 33 = 1781 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 207 + 145 = 357 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 77 × 84 = 6468 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 14 × 65 = 905 right or wrong? (a) Wrong (b) Right

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