Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 169 · 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 174 + 536 = 710 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 72 × 23 = 1656 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 358 + 767 = 1128 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 437 + 663 = 1100 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 83 × 61 = 5069 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 977 + 173 = 1155 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 316 + 304 = 620 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 46 × 71 = 3261 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 54 × 44 = 2371 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 66 × 82 = 5412 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 161 + 898 = 1054 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 161 + 710 = 871 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 76 × 80 = 6080 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 32 × 43 = 1376 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 457 + 119 = 576 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 350 + 369 = 719 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 58 × 23 = 1334 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 41 × 75 = 3075 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 43 × 13 = 559 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 979 + 215 = 1194 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 804 + 670 = 1479 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 321 + 414 = 735 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 871 + 464 = 1330 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 860 + 298 = 1154 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 941 + 980 = 1921 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 29 × 58 = 1682 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 75 × 42 = 3142 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 18 × 62 = 1108 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 81 × 17 = 1377 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 69 × 45 = 3108 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 428 + 579 = 1007 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 64 × 78 = 4998 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 193 + 527 = 724 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 62 × 30 = 1860 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 347 + 321 = 675 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 830 + 968 = 1798 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 285 + 848 = 1136 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 48 × 26 = 1241 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 239 + 675 = 905 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 27 × 30 = 810 right or wrong? (a) Wrong (b) Right

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