Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 905 · 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 26 × 61 = 1586 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 40 × 97 = 3884 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 78 × 70 = 5460 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 147 + 234 = 376 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 33 × 27 = 884 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 208 + 891 = 1102 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 64 × 23 = 1472 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 85 × 42 = 3570 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 431 + 363 = 795 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 86 × 46 = 3956 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 18 × 92 = 1656 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 856 + 308 = 1164 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 130 + 738 = 868 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 531 + 595 = 1132 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 938 + 977 = 1912 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 647 + 571 = 1227 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 504 + 255 = 759 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 856 + 424 = 1280 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 515 + 816 = 1331 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 58 × 63 = 3654 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 786 + 377 = 1163 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 26 × 74 = 1932 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 146 + 366 = 512 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 208 + 799 = 1001 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 171 + 127 = 298 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 967 + 480 = 1452 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 863 + 166 = 1028 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 842 + 213 = 1055 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 69 × 99 = 6832 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 569 + 235 = 812 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 936 + 563 = 1505 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 53 × 71 = 3763 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 35 × 29 = 1010 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 36 × 46 = 1656 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 26 × 18 = 468 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 723 + 526 = 1249 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 132 + 138 = 270 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 35 × 95 = 3325 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 837 + 324 = 1167 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 73 × 24 = 1744 right or wrong? (a) Right (b) Wrong

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