Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 390 · 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 393 + 960 = 1353 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 332 + 903 = 1235 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 945 + 136 = 1087 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 21 × 13 = 273 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 246 + 964 = 1210 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 70 × 26 = 1828 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 18 × 85 = 1524 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 84 × 59 = 4956 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 349 + 950 = 1305 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 15 × 69 = 1037 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 144 + 558 = 700 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 362 + 163 = 525 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 49 × 19 = 933 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 198 + 530 = 728 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 35 × 14 = 481 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 633 + 690 = 1319 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 963 + 537 = 1509 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 979 + 305 = 1284 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 247 + 270 = 517 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 226 + 572 = 798 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 61 × 23 = 1403 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 395 + 814 = 1209 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 51 × 53 = 2698 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 759 + 789 = 1548 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 412 + 636 = 1045 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 73 × 83 = 6057 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 802 + 336 = 1142 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 513 + 926 = 1439 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 73 × 77 = 5623 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 50 × 87 = 4347 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 66 × 93 = 6138 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 39 × 24 = 936 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 33 × 37 = 1221 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 76 × 28 = 2125 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 98 × 28 = 2737 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 19 × 12 = 236 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 591 + 274 = 860 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 88 × 33 = 2905 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 21 × 26 = 547 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 43 × 29 = 1247 right or wrong? (a) Wrong (b) Right

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