Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 125 · 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 532 + 395 = 931 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 14 × 49 = 677 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 514 + 538 = 1052 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 289 + 250 = 539 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 822 + 348 = 1170 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 306 + 529 = 835 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 52 × 67 = 3493 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 756 + 577 = 1333 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 834 + 658 = 1499 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 500 + 688 = 1188 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 480 + 821 = 1305 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 315 + 840 = 1150 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 54 × 74 = 3987 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 254 + 443 = 698 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 53 × 94 = 4982 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 970 + 688 = 1658 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 96 × 67 = 6441 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 24 × 14 = 333 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 272 + 326 = 599 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 78 × 44 = 3426 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 86 × 67 = 5771 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 54 × 83 = 4482 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 258 + 830 = 1089 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 43 × 27 = 1161 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 17 × 18 = 313 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 773 + 253 = 1026 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 540 + 266 = 806 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 57 × 44 = 2509 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 994 + 273 = 1267 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 95 × 21 = 1999 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 326 + 373 = 704 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 24 × 32 = 764 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 24 × 54 = 1287 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 787 + 438 = 1224 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 727 + 437 = 1164 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 17 × 25 = 425 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 475 + 331 = 806 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 517 + 220 = 728 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 97 × 90 = 8730 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 601 + 761 = 1362 right or wrong? (a) Right (b) Wrong

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