Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 164 · 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 42 × 21 = 881 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 25 × 79 = 1978 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 139 + 859 = 998 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 157 + 518 = 678 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 299 + 470 = 770 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 73 × 31 = 2264 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 64 × 12 = 768 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 82 × 66 = 5405 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 200 + 275 = 471 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 848 + 865 = 1713 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 36 × 57 = 2052 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 514 + 529 = 1045 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 412 + 649 = 1061 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 58 × 25 = 1458 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 24 × 81 = 1943 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 52 × 27 = 1413 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 127 + 582 = 709 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 850 + 903 = 1753 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 23 × 55 = 1265 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 833 + 862 = 1698 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 91 × 35 = 3185 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 20 × 14 = 280 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 37 × 99 = 3663 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 969 + 338 = 1307 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 18 × 88 = 1584 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 501 + 273 = 774 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 71 × 24 = 1711 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 39 × 20 = 780 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 564 + 176 = 740 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 143 + 614 = 757 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 214 + 544 = 762 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 165 + 200 = 366 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 27 × 93 = 2511 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 135 + 228 = 363 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 794 + 517 = 1304 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 425 + 456 = 881 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 815 + 719 = 1534 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 26 × 41 = 1066 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 318 + 218 = 536 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 49 × 83 = 4067 right or wrong? (a) Wrong (b) Right

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