Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 198 · 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 498 + 733 = 1231 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 15 × 35 = 525 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 40 × 76 = 3040 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 86 × 43 = 3698 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 89 × 25 = 2222 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 35 × 28 = 980 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 40 × 75 = 3000 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 835 + 910 = 1745 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 543 + 498 = 1041 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 424 + 271 = 695 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 21 × 60 = 1260 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 64 × 72 = 4608 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 70 × 24 = 1680 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 816 + 540 = 1350 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 858 + 124 = 988 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 28 × 81 = 2259 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 255 + 852 = 1106 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 24 × 90 = 2167 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 79 × 87 = 6873 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 189 + 469 = 658 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 97 × 90 = 8730 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 26 × 53 = 1375 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 487 + 178 = 665 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 46 × 22 = 1010 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 88 × 20 = 1760 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 285 + 215 = 507 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 277 + 226 = 504 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 31 × 15 = 462 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 235 + 557 = 792 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 249 + 290 = 539 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 558 + 428 = 986 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 190 + 555 = 745 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 635 + 772 = 1398 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 47 × 86 = 4044 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 82 × 23 = 1886 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 98 × 31 = 3033 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 237 + 554 = 791 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 143 + 314 = 449 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 22 × 36 = 791 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 59 × 13 = 767 right or wrong? (a) Wrong (b) Right

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