Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 156 · 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 24 × 31 = 741 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 49 × 63 = 3093 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 65 × 73 = 4745 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 437 + 294 = 740 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 886 + 345 = 1230 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 640 + 637 = 1268 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 41 × 34 = 1391 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 405 + 915 = 1320 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 69 × 88 = 6070 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 27 × 41 = 1107 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 332 + 291 = 625 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 25 × 92 = 2305 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 51 × 85 = 4331 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 105 + 574 = 679 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 34 × 83 = 2822 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 651 + 288 = 937 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 15 × 34 = 510 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 992 + 497 = 1489 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 50 × 18 = 900 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 44 × 83 = 3658 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 351 + 332 = 690 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 487 + 585 = 1076 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 27 × 22 = 598 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 256 + 992 = 1248 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 963 + 504 = 1461 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 97 × 73 = 7089 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 563 + 170 = 733 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 46 × 26 = 1196 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 286 + 357 = 648 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 131 + 235 = 364 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 635 + 504 = 1139 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 486 + 752 = 1239 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 620 + 384 = 1004 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 615 + 433 = 1048 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 67 × 26 = 1749 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 436 + 215 = 651 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 83 × 77 = 6390 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 465 + 486 = 949 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 836 + 949 = 1785 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 21 × 91 = 1905 right or wrong? (a) Wrong (b) Right

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