Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 312 · 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 912 + 993 = 1905 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 97 × 93 = 9014 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 32 × 87 = 2784 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 990 + 662 = 1652 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 83 × 56 = 4651 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 86 × 93 = 7998 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 591 + 291 = 879 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 21 × 63 = 1326 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 24 × 83 = 1992 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 71 × 86 = 6106 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 70 × 17 = 1190 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 119 + 511 = 632 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 910 + 732 = 1640 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 91 × 37 = 3363 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 995 + 889 = 1884 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 989 + 128 = 1117 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 669 + 818 = 1487 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 222 + 305 = 527 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 86 × 13 = 1113 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 133 + 200 = 342 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 415 + 990 = 1406 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 27 × 57 = 1544 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 56 × 21 = 1180 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 298 + 459 = 751 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 118 + 458 = 576 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 33 × 91 = 3004 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 453 + 893 = 1346 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 28 × 30 = 840 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 278 + 927 = 1205 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 28 × 31 = 868 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 16 × 17 = 272 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 64 × 85 = 5431 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 38 × 40 = 1520 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 76 × 35 = 2660 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 41 × 67 = 2747 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 984 + 921 = 1905 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 151 + 393 = 544 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 349 + 991 = 1334 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 57 × 72 = 4102 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 16 × 90 = 1441 right or wrong? (a) Right (b) Wrong

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