Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 571 · 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 886 + 608 = 1494 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 460 + 784 = 1247 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 369 + 176 = 542 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 79 × 28 = 2214 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 199 + 551 = 750 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 21 × 67 = 1399 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 41 × 91 = 3731 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 20 × 18 = 352 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 830 + 848 = 1682 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 443 + 846 = 1289 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 35 × 17 = 595 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 522 + 952 = 1483 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 458 + 729 = 1187 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 23 × 97 = 2231 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 71 × 71 = 5037 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 37 × 95 = 3515 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 92 × 41 = 3777 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 68 × 92 = 6256 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 194 + 486 = 680 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 76 × 98 = 7448 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 279 + 855 = 1136 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 12 × 60 = 727 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 920 + 865 = 1789 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 77 × 30 = 2309 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 61 × 16 = 982 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 990 + 299 = 1289 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 726 + 632 = 1358 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 64 × 26 = 1664 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 567 + 195 = 762 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 87 × 93 = 8091 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 182 + 293 = 475 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 23 × 92 = 2113 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 454 + 373 = 827 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 75 × 88 = 6605 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 93 × 81 = 7533 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 748 + 948 = 1704 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 93 × 96 = 8924 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 199 + 957 = 1156 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 79 × 93 = 7347 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 96 × 89 = 8544 right or wrong? (a) Right (b) Wrong

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