Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 217 · 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 265 + 680 = 945 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 325 + 194 = 512 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 185 + 968 = 1152 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 27 × 37 = 990 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 949 + 650 = 1594 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 99 × 44 = 4356 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 599 + 475 = 1072 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 945 + 394 = 1348 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 88 × 67 = 5890 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 256 + 621 = 868 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 302 + 739 = 1050 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 804 + 938 = 1748 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 14 × 22 = 308 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 98 × 35 = 3430 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 97 × 32 = 3104 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 24 × 40 = 964 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 835 + 414 = 1249 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 58 × 96 = 5568 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 610 + 403 = 1015 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 73 × 30 = 2181 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 56 × 86 = 4819 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 898 + 551 = 1448 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 895 + 897 = 1783 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 355 + 968 = 1321 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 72 × 17 = 1218 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 562 + 893 = 1455 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 29 × 58 = 1688 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 602 + 412 = 1014 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 78 × 56 = 4368 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 256 + 257 = 513 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 81 × 49 = 3969 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 32 × 76 = 2432 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 22 × 29 = 644 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 43 × 17 = 731 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 65 × 60 = 3902 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 560 + 116 = 679 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 401 + 326 = 727 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 28 × 36 = 1008 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 31 × 89 = 2761 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 13 × 45 = 579 right or wrong? (a) Right (b) Wrong

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