Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 368 · 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 77 × 58 = 4466 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 427 + 495 = 922 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 52 × 98 = 5097 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 197 + 542 = 739 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 509 + 943 = 1452 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 340 + 807 = 1146 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 20 × 49 = 980 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 83 × 84 = 6980 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 246 + 173 = 419 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 994 + 837 = 1831 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 83 × 26 = 2158 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 62 × 85 = 5272 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 295 + 270 = 564 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 935 + 148 = 1083 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 43 × 73 = 3139 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 217 + 268 = 486 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 258 + 856 = 1108 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 190 + 600 = 792 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 87 × 96 = 8353 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 67 × 82 = 5494 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 37 × 60 = 2220 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 480 + 805 = 1285 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 75 × 68 = 5106 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 384 + 245 = 629 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 54 × 68 = 3668 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 307 + 633 = 940 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 75 × 93 = 6981 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 48 × 61 = 2928 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 79 × 46 = 3634 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 394 + 563 = 957 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 311 + 164 = 475 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 26 × 97 = 2522 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 862 + 878 = 1736 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 461 + 493 = 952 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 33 × 93 = 3069 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 65 × 95 = 6169 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 71 × 22 = 1562 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 803 + 940 = 1744 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 238 + 808 = 1040 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 12 × 33 = 401 right or wrong? (a) Wrong (b) Right

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