Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 175 · 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 312 + 423 = 733 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 826 + 506 = 1340 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 273 + 191 = 464 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 95 × 62 = 5892 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 336 + 851 = 1187 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 13 × 36 = 468 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 246 + 861 = 1115 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 23 × 56 = 1289 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 21 × 49 = 1024 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 803 + 877 = 1680 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 798 + 107 = 905 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 837 + 488 = 1325 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 927 + 703 = 1630 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 84 × 52 = 4368 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 885 + 142 = 1033 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 179 + 773 = 952 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 35 × 34 = 1190 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 33 × 93 = 3069 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 801 + 941 = 1750 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 73 × 70 = 5110 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 57 × 93 = 5298 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 217 + 363 = 572 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 241 + 705 = 937 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 634 + 343 = 979 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 36 × 13 = 474 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 735 + 612 = 1344 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 55 × 58 = 3185 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 78 × 24 = 1872 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 381 + 501 = 882 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 24 × 35 = 840 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 375 + 528 = 903 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 44 × 38 = 1672 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 70 × 68 = 4760 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 29 × 53 = 1544 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 38 × 27 = 1026 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 31 × 49 = 1519 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 462 + 194 = 656 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 942 + 871 = 1813 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 333 + 416 = 749 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 19 × 29 = 543 right or wrong? (a) Right (b) Wrong

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