Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 389 · 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 283 + 255 = 539 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 70 × 95 = 6650 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 243 + 250 = 489 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 76 × 53 = 4028 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 973 + 520 = 1490 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 641 + 179 = 817 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 655 + 635 = 1288 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 76 × 94 = 7144 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 147 + 303 = 456 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 13 × 93 = 1208 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 179 + 297 = 476 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 782 + 931 = 1720 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 74 × 64 = 4735 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 44 × 15 = 660 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 381 + 668 = 1044 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 853 + 211 = 1064 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 15 × 24 = 360 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 84 × 95 = 7979 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 372 + 857 = 1229 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 575 + 857 = 1432 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 744 + 320 = 1056 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 293 + 610 = 903 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 414 + 473 = 889 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 21 × 60 = 1260 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 953 + 136 = 1089 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 963 + 918 = 1879 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 641 + 800 = 1441 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 95 × 35 = 3325 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 93 × 74 = 6882 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 420 + 463 = 878 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 245 + 446 = 691 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 17 × 45 = 765 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 774 + 489 = 1263 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 34 × 93 = 3170 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 72 × 24 = 1733 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 493 + 376 = 868 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 94 × 17 = 1598 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 76 × 16 = 1225 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 212 + 167 = 379 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 781 + 767 = 1548 right or wrong? (a) Right (b) Wrong

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