Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 836 · 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 97 × 54 = 5238 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 70 × 35 = 2450 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 289 + 238 = 523 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 22 × 73 = 1606 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 918 + 129 = 1050 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 580 + 952 = 1532 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 54 × 26 = 1406 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 82 × 14 = 1156 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 246 + 738 = 984 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 917 + 802 = 1722 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 641 + 704 = 1345 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 859 + 720 = 1583 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 41 × 97 = 3977 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 476 + 221 = 697 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 809 + 112 = 921 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 489 + 644 = 1134 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 34 × 24 = 816 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 51 × 94 = 4790 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 55 × 80 = 4399 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 978 + 475 = 1453 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 125 + 479 = 604 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 35 × 95 = 3328 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 49 × 98 = 4805 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 705 + 234 = 939 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 23 × 18 = 413 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 180 + 649 = 829 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 64 × 51 = 3271 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 26 × 35 = 910 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 36 × 18 = 648 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 205 + 527 = 732 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 470 + 261 = 725 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 621 + 607 = 1226 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 193 + 197 = 393 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 46 × 86 = 3956 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 25 × 25 = 625 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 60 × 37 = 2212 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 37 × 78 = 2890 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 71 × 27 = 1917 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 949 + 820 = 1769 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 842 + 536 = 1370 right or wrong? (a) Right (b) Wrong

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