Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 104 · 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 65 × 69 = 4477 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 271 + 293 = 555 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 724 + 375 = 1099 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 82 × 82 = 6728 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 94 × 91 = 8554 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 63 × 72 = 4536 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 828 + 638 = 1466 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 13 × 44 = 576 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 256 + 763 = 1023 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 18 × 13 = 234 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 48 × 91 = 4375 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 16 × 37 = 592 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 483 + 881 = 1364 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 18 × 58 = 1041 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 79 × 15 = 1185 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 284 + 142 = 420 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 210 + 593 = 803 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 263 + 137 = 400 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 50 × 79 = 3943 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 93 × 24 = 2233 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 65 × 14 = 907 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 36 × 55 = 1980 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 656 + 348 = 1004 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 123 + 489 = 609 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 532 + 877 = 1409 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 131 + 641 = 769 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 87 × 50 = 4350 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 572 + 499 = 1071 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 42 × 45 = 1890 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 59 × 72 = 4249 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 153 + 271 = 427 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 56 × 25 = 1400 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 89 × 60 = 5340 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 375 + 514 = 894 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 732 + 202 = 934 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 268 + 337 = 605 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 269 + 730 = 1007 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 12 × 59 = 712 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 204 + 889 = 1087 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 460 + 540 = 1002 right or wrong? (a) Wrong (b) Right

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