Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 634 · 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 748 + 363 = 1111 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 112 + 986 = 1098 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 58 × 79 = 4582 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 898 + 736 = 1634 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 96 × 36 = 3456 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 57 × 85 = 4841 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 36 × 38 = 1368 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 379 + 907 = 1285 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 704 + 288 = 992 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 793 + 877 = 1663 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 970 + 242 = 1212 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 69 × 40 = 2760 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 19 × 80 = 1520 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 16 × 75 = 1200 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 51 × 20 = 1020 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 663 + 663 = 1326 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 878 + 818 = 1702 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 181 + 529 = 707 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 91 × 64 = 5824 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 76 × 73 = 5548 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 122 + 959 = 1077 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 36 × 68 = 2448 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 84 × 36 = 3021 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 359 + 359 = 727 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 68 × 12 = 816 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 28 × 81 = 2271 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 493 + 868 = 1361 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 13 × 41 = 533 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 32 × 30 = 960 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 666 + 387 = 1053 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 532 + 648 = 1180 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 151 + 787 = 938 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 77 × 17 = 1309 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 968 + 448 = 1416 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 24 × 78 = 1875 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 40 × 98 = 3920 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 38 × 49 = 1862 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 916 + 933 = 1849 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 38 × 41 = 1562 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 630 + 624 = 1247 right or wrong? (a) Right (b) Wrong

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