Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 28 · 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 508 + 817 = 1325 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 629 + 344 = 973 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 250 + 180 = 423 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 251 + 378 = 633 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 43 × 86 = 3698 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 405 + 887 = 1297 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 54 × 42 = 2268 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 98 × 29 = 2840 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 567 + 425 = 994 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 808 + 457 = 1256 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 647 + 882 = 1529 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 39 × 80 = 3120 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 53 × 33 = 1745 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 872 + 351 = 1223 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 158 + 447 = 605 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 116 + 187 = 298 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 98 × 15 = 1470 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 777 + 271 = 1053 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 36 × 91 = 3276 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 64 × 17 = 1088 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 38 × 55 = 2090 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 329 + 184 = 513 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 857 + 368 = 1234 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 344 + 801 = 1146 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 20 × 82 = 1632 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 64 × 67 = 4287 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 92 × 99 = 9105 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 47 × 76 = 3563 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 26 × 24 = 624 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 544 + 535 = 1078 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 747 + 127 = 874 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 825 + 283 = 1108 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 77 × 51 = 3926 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 69 × 47 = 3251 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 668 + 216 = 884 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 986 + 859 = 1845 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 963 + 607 = 1573 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 56 × 81 = 4536 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 30 × 96 = 2880 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 230 + 335 = 565 right or wrong? (a) Right (b) Wrong

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