Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 970 · 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 336 + 990 = 1326 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 40 × 30 = 1191 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 645 + 120 = 763 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 79 × 35 = 2771 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 363 + 935 = 1298 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 72 × 57 = 4113 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 84 × 19 = 1593 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 204 + 536 = 748 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 210 + 880 = 1090 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 246 + 679 = 922 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 558 + 479 = 1037 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 83 × 65 = 5395 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 26 × 33 = 860 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 799 + 686 = 1485 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 992 + 950 = 1942 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 31 × 91 = 2820 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 224 + 359 = 592 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 342 + 739 = 1081 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 50 × 37 = 1851 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 52 × 61 = 3172 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 78 × 27 = 2106 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 769 + 653 = 1422 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 33 × 26 = 849 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 50 × 50 = 2500 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 85 × 36 = 3060 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 62 × 68 = 4216 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 345 + 467 = 818 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 331 + 843 = 1174 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 74 × 98 = 7252 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 40 × 88 = 3520 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 15 × 30 = 448 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 215 + 396 = 611 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 80 × 61 = 4880 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 776 + 341 = 1117 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 449 + 196 = 645 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 132 + 167 = 299 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 19 × 47 = 893 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 18 × 71 = 1286 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 559 + 704 = 1272 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 865 + 135 = 1007 right or wrong? (a) Wrong (b) Right

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