Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 861 · 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 455 + 861 = 1321 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 551 + 643 = 1194 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 327 + 921 = 1248 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 28 × 59 = 1652 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 12 × 34 = 410 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 242 + 723 = 965 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 78 × 72 = 5622 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 316 + 273 = 589 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 707 + 848 = 1555 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 54 × 41 = 2219 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 83 × 21 = 1743 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 76 × 66 = 5016 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 19 × 64 = 1222 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 971 + 252 = 1218 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 601 + 290 = 891 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 598 + 243 = 839 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 21 × 18 = 369 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 672 + 362 = 1026 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 953 + 125 = 1078 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 95 × 32 = 3038 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 836 + 958 = 1801 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 412 + 141 = 553 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 327 + 557 = 884 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 29 × 34 = 986 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 72 × 26 = 1872 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 14 × 66 = 919 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 47 × 24 = 1125 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 889 + 680 = 1562 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 198 + 492 = 689 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 26 × 92 = 2386 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 836 + 356 = 1192 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 95 × 36 = 3426 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 259 + 727 = 986 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 516 + 928 = 1439 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 49 × 32 = 1572 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 54 × 95 = 5130 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 65 × 87 = 5652 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 514 + 505 = 1021 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 991 + 844 = 1835 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 414 + 509 = 923 right or wrong? (a) Right (b) Wrong

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