Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 671 · 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 26 × 82 = 2132 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 56 × 42 = 2348 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 72 × 63 = 4529 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 878 + 231 = 1109 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 772 + 217 = 989 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 46 × 49 = 2255 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 35 × 88 = 3080 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 675 + 637 = 1312 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 135 + 700 = 835 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 86 × 17 = 1457 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 27 × 39 = 1053 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 977 + 493 = 1464 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 19 × 98 = 1862 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 282 + 396 = 678 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 536 + 915 = 1448 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 314 + 154 = 468 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 15 × 73 = 1093 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 66 × 71 = 4687 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 359 + 494 = 853 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 65 × 71 = 4615 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 218 + 953 = 1171 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 50 × 59 = 2956 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 83 × 19 = 1577 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 156 + 328 = 484 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 96 × 88 = 8448 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 15 × 60 = 897 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 45 × 53 = 2379 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 254 + 815 = 1069 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 90 × 90 = 8106 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 297 + 938 = 1229 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 611 + 690 = 1307 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 69 × 84 = 5789 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 26 × 47 = 1227 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 256 + 365 = 621 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 25 × 57 = 1424 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 800 + 597 = 1397 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 904 + 339 = 1243 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 219 + 508 = 727 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 259 + 751 = 1011 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 605 + 111 = 721 right or wrong? (a) Right (b) Wrong

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