Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 599 · 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 722 + 816 = 1538 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 78 × 17 = 1321 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 559 + 502 = 1061 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 25 × 95 = 2375 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 165 + 489 = 654 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 40 × 64 = 2564 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 85 × 28 = 2372 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 774 + 225 = 999 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 212 + 208 = 420 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 69 × 14 = 965 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 511 + 451 = 962 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 36 × 20 = 720 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 945 + 584 = 1521 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 902 + 323 = 1225 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 20 × 35 = 700 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 804 + 640 = 1444 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 579 + 475 = 1049 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 162 + 185 = 339 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 942 + 386 = 1328 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 174 + 528 = 699 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 25 × 23 = 575 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 63 × 84 = 5289 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 20 × 43 = 867 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 990 + 987 = 1977 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 542 + 533 = 1069 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 70 × 82 = 5740 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 12 × 59 = 704 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 589 + 452 = 1041 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 394 + 816 = 1210 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 32 × 76 = 2432 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 153 + 872 = 1023 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 90 × 77 = 6930 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 13 × 63 = 819 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 66 × 24 = 1586 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 77 × 59 = 4543 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 164 + 892 = 1056 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 93 × 79 = 7347 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 883 + 296 = 1179 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 287 + 214 = 501 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 195 + 279 = 474 right or wrong? (a) Wrong (b) Right

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