Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 818 · 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 45 × 70 = 3150 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 273 + 856 = 1135 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 350 + 363 = 707 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 82 × 90 = 7378 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 96 × 92 = 8827 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 92 × 97 = 8919 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 68 × 57 = 3882 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 49 × 18 = 882 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 405 + 959 = 1362 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 135 + 886 = 1021 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 132 + 642 = 774 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 41 × 95 = 3895 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 743 + 286 = 1029 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 889 + 495 = 1384 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 881 + 329 = 1210 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 46 × 95 = 4364 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 34 × 60 = 2033 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 248 + 409 = 650 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 757 + 627 = 1384 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 814 + 730 = 1544 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 50 × 82 = 4102 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 65 × 68 = 4413 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 27 × 79 = 2133 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 35 × 53 = 1855 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 357 + 264 = 620 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 79 × 39 = 3081 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 126 + 726 = 847 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 35 × 36 = 1260 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 93 × 27 = 2511 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 213 + 686 = 903 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 271 + 292 = 563 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 36 × 46 = 1656 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 56 × 24 = 1344 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 62 × 76 = 4720 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 242 + 739 = 981 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 64 × 85 = 5440 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 706 + 294 = 993 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 85 × 27 = 2293 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 428 + 765 = 1193 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 66 × 51 = 3360 right or wrong? (a) Right (b) Wrong

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