Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 731 · 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 23 × 99 = 2277 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 490 + 440 = 930 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 543 + 549 = 1097 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 199 + 443 = 642 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 433 + 705 = 1134 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 900 + 286 = 1186 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 285 + 966 = 1251 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 624 + 909 = 1533 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 34 × 28 = 952 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 59 × 76 = 4484 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 60 × 97 = 5815 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 423 + 433 = 856 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 153 + 454 = 610 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 722 + 285 = 1007 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 32 × 36 = 1152 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 13 × 85 = 1105 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 311 + 652 = 961 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 994 + 395 = 1397 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 520 + 657 = 1177 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 94 × 75 = 7044 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 200 + 440 = 636 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 106 + 245 = 352 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 35 × 33 = 1155 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 45 × 89 = 4005 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 143 + 238 = 389 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 83 × 79 = 6557 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 420 + 510 = 936 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 431 + 228 = 659 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 129 + 494 = 628 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 811 + 936 = 1748 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 986 + 547 = 1539 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 235 + 540 = 775 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 21 × 59 = 1243 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 948 + 979 = 1927 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 87 × 33 = 2871 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 257 + 326 = 583 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 383 + 887 = 1267 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 356 + 109 = 465 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 19 × 84 = 1596 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 380 + 529 = 909 right or wrong? (a) Wrong (b) Right

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