Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 355 · 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 44 × 74 = 3259 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 73 × 50 = 3650 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 57 × 55 = 3126 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 58 × 25 = 1450 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 307 + 178 = 494 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 62 × 62 = 3844 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 36 × 52 = 1869 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 81 × 29 = 2349 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 43 × 78 = 3362 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 253 + 258 = 511 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 905 + 426 = 1331 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 351 + 891 = 1246 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 565 + 569 = 1134 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 642 + 154 = 796 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 17 × 38 = 646 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 359 + 327 = 686 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 76 × 60 = 4555 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 66 × 31 = 2050 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 74 × 12 = 888 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 664 + 415 = 1079 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 35 × 80 = 2807 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 978 + 789 = 1758 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 571 + 891 = 1462 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 408 + 820 = 1228 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 894 + 314 = 1208 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 276 + 938 = 1214 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 151 + 267 = 418 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 82 × 37 = 3029 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 15 × 39 = 585 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 742 + 193 = 932 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 734 + 176 = 906 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 78 × 41 = 3198 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 177 + 625 = 802 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 440 + 701 = 1141 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 28 × 67 = 1876 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 91 × 51 = 4641 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 74 × 80 = 5920 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 94 × 96 = 9024 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 350 + 599 = 949 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 19 × 75 = 1425 right or wrong? (a) Wrong (b) Right

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