Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 842 · 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 19 × 79 = 1501 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 234 + 205 = 439 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 666 + 129 = 795 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 89 × 29 = 2581 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 93 × 48 = 4464 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 26 × 99 = 2572 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 195 + 364 = 557 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 866 + 898 = 1764 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 52 × 14 = 735 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 807 + 443 = 1255 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 350 + 702 = 1052 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 556 + 506 = 1054 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 52 × 18 = 936 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 84 × 18 = 1508 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 51 × 61 = 3120 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 882 + 503 = 1385 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 93 × 64 = 5945 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 200 + 485 = 676 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 75 × 53 = 3967 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 707 + 157 = 857 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 760 + 559 = 1319 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 62 × 99 = 6138 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 160 + 124 = 284 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 75 × 77 = 5768 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 504 + 510 = 1019 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 93 × 32 = 2976 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 184 + 212 = 391 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 862 + 921 = 1785 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 744 + 156 = 903 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 983 + 237 = 1229 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 21 × 73 = 1533 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 921 + 491 = 1412 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 149 + 213 = 362 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 960 + 707 = 1667 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 33 × 34 = 1128 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 71 × 51 = 3621 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 310 + 711 = 1021 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 60 × 27 = 1617 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 37 × 63 = 2331 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 553 + 808 = 1361 right or wrong? (a) Right (b) Wrong

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