Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 463 · 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 627 + 138 = 765 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 18 × 22 = 400 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 998 + 432 = 1429 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 516 + 232 = 741 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 254 + 174 = 428 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 36 × 82 = 2952 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 50 × 56 = 2800 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 58 × 84 = 4863 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 28 × 74 = 2066 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 17 × 67 = 1134 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 71 × 44 = 3124 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 997 + 879 = 1883 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 84 × 26 = 2182 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 968 + 257 = 1225 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 982 + 872 = 1854 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 82 × 85 = 6976 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 721 + 530 = 1251 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 522 + 120 = 642 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 532 + 818 = 1355 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 711 + 543 = 1260 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 74 × 70 = 5180 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 225 + 341 = 566 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 127 + 814 = 941 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 37 × 23 = 853 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 42 × 62 = 2604 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 17 × 21 = 357 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 240 + 480 = 720 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 554 + 895 = 1449 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 75 × 67 = 5025 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 59 × 77 = 4538 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 309 + 736 = 1041 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 48 × 16 = 768 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 66 × 63 = 4158 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 831 + 165 = 993 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 60 × 71 = 4260 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 95 × 34 = 3230 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 865 + 333 = 1198 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 92 × 12 = 1096 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 687 + 560 = 1247 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 39 × 98 = 3822 right or wrong? (a) Right (b) Wrong

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