Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 49 · 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 67 × 65 = 4361 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 479 + 141 = 613 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 90 × 72 = 6488 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 80 × 66 = 5279 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 23 × 50 = 1150 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 67 × 41 = 2747 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 503 + 568 = 1071 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 732 + 529 = 1256 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 50 × 18 = 900 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 34 × 86 = 2923 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 39 × 62 = 2418 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 16 × 57 = 916 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 768 + 215 = 990 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 751 + 302 = 1051 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 51 × 90 = 4583 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 61 × 35 = 2127 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 78 × 79 = 6162 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 68 × 92 = 6249 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 93 × 63 = 5859 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 66 × 25 = 1650 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 467 + 466 = 932 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 910 + 989 = 1896 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 891 + 660 = 1558 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 296 + 118 = 414 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 513 + 841 = 1354 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 883 + 323 = 1210 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 421 + 723 = 1139 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 83 × 47 = 3901 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 841 + 695 = 1536 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 878 + 132 = 1010 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 720 + 557 = 1277 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 942 + 738 = 1677 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 21 × 31 = 651 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 665 + 899 = 1564 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 288 + 190 = 477 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 637 + 778 = 1415 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 35 × 40 = 1407 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 13 × 60 = 780 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 391 + 320 = 711 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 290 + 129 = 410 right or wrong? (a) Right (b) Wrong

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