Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 515 · 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 246 + 258 = 504 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 530 + 203 = 726 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 438 + 481 = 927 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 69 × 68 = 4695 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 371 + 123 = 494 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 222 + 353 = 575 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 867 + 433 = 1299 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 33 × 15 = 495 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 92 × 13 = 1201 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 488 + 946 = 1426 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 67 × 35 = 2345 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 92 × 37 = 3401 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 670 + 115 = 785 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 825 + 927 = 1750 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 203 + 635 = 838 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 52 × 55 = 2851 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 46 × 44 = 2020 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 646 + 706 = 1352 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 40 × 13 = 520 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 353 + 781 = 1138 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 562 + 836 = 1405 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 253 + 427 = 680 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 895 + 908 = 1807 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 30 × 80 = 2401 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 374 + 140 = 515 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 506 + 159 = 665 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 71 × 91 = 6468 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 37 × 14 = 509 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 766 + 252 = 1024 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 35 × 13 = 455 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 88 × 12 = 1060 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 50 × 90 = 4494 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 79 × 38 = 2997 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 70 × 48 = 3360 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 14 × 64 = 897 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 32 × 47 = 1502 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 70 × 57 = 3983 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 99 × 49 = 4856 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 995 + 546 = 1536 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 483 + 884 = 1367 right or wrong? (a) Right (b) Wrong

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