Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 578 · 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 487 + 872 = 1352 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 58 × 68 = 3951 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 710 + 604 = 1314 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 651 + 911 = 1562 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 66 × 77 = 5082 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 394 + 296 = 692 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 19 × 31 = 591 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 701 + 129 = 837 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 167 + 756 = 923 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 65 × 76 = 4940 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 67 × 22 = 1474 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 99 × 29 = 2877 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 55 × 53 = 2911 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 319 + 974 = 1293 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 736 + 953 = 1689 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 421 + 491 = 908 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 459 + 427 = 886 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 66 × 94 = 6203 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 192 + 136 = 335 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 82 × 43 = 3517 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 24 × 29 = 703 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 841 + 344 = 1181 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 710 + 208 = 918 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 89 × 15 = 1330 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 60 × 96 = 5760 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 17 × 29 = 500 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 553 + 650 = 1194 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 90 × 14 = 1263 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 399 + 605 = 1002 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 835 + 627 = 1470 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 192 + 742 = 943 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 84 × 93 = 7819 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 542 + 451 = 993 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 789 + 673 = 1464 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 60 × 67 = 4020 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 79 × 91 = 7196 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 41 × 16 = 656 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 45 × 29 = 1305 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 616 + 200 = 821 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 314 + 452 = 766 right or wrong? (a) Wrong (b) Right

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