Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 758 · 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 94 × 49 = 4609 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 951 + 242 = 1189 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 17 × 64 = 1095 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 85 × 25 = 2125 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 36 × 89 = 3204 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 12 × 16 = 192 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 18 × 24 = 432 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 117 + 912 = 1029 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 489 + 863 = 1352 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 30 × 63 = 1890 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 19 × 59 = 1121 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 863 + 650 = 1513 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 515 + 298 = 813 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 20 × 15 = 308 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 48 × 30 = 1440 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 18 × 63 = 1132 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 534 + 304 = 834 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 768 + 990 = 1756 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 45 × 29 = 1308 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 85 × 30 = 2541 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 39 × 20 = 780 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 815 + 162 = 977 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 278 + 344 = 618 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 80 × 37 = 2960 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 708 + 512 = 1229 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 87 × 16 = 1392 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 17 × 27 = 459 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 38 × 53 = 2014 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 84 × 26 = 2184 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 600 + 233 = 833 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 17 × 54 = 918 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 129 + 559 = 688 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 482 + 420 = 902 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 426 + 106 = 532 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 840 + 302 = 1134 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 39 × 23 = 897 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 630 + 994 = 1624 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 188 + 145 = 335 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 289 + 408 = 697 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 897 + 719 = 1616 right or wrong? (a) Wrong (b) Right

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