Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 852 · 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 287 + 451 = 738 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 30 × 91 = 2725 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 32 × 74 = 2367 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 258 + 599 = 857 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 715 + 390 = 1111 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 18 × 62 = 1120 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 689 + 742 = 1431 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 396 + 443 = 833 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 131 + 205 = 343 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 184 + 204 = 388 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 126 + 988 = 1114 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 505 + 674 = 1187 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 852 + 164 = 1018 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 750 + 496 = 1238 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 52 × 12 = 625 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 59 × 58 = 3420 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 26 × 83 = 2164 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 72 × 66 = 4753 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 651 + 277 = 928 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 994 + 142 = 1130 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 938 + 847 = 1788 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 895 + 993 = 1888 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 224 + 189 = 414 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 273 + 216 = 484 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 246 + 553 = 800 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 998 + 900 = 1898 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 60 × 44 = 2640 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 215 + 483 = 698 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 32 × 75 = 2400 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 173 + 165 = 344 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 175 + 423 = 598 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 31 × 80 = 2486 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 93 × 92 = 8560 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 691 + 402 = 1093 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 277 + 787 = 1073 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 435 + 727 = 1158 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 70 × 51 = 3570 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 19 × 24 = 454 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 978 + 272 = 1250 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 19 × 93 = 1767 right or wrong? (a) Right (b) Wrong

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