Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 135 · 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 664 + 598 = 1260 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 459 + 650 = 1109 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 86 × 85 = 7318 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 33 × 60 = 1978 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 76 × 13 = 984 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 195 + 139 = 332 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 58 × 21 = 1218 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 73 × 94 = 6870 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 259 + 521 = 781 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 38 × 47 = 1786 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 74 × 60 = 4440 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 331 + 663 = 1001 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 33 × 22 = 718 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 255 + 984 = 1239 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 37 × 39 = 1436 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 49 × 34 = 1666 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 381 + 666 = 1047 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 861 + 484 = 1338 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 20 × 22 = 440 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 895 + 176 = 1066 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 75 × 20 = 1501 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 14 × 94 = 1316 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 519 + 642 = 1161 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 961 + 610 = 1571 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 99 × 36 = 3566 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 155 + 343 = 498 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 39 × 35 = 1365 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 22 × 25 = 551 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 348 + 304 = 643 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 29 × 61 = 1775 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 32 × 39 = 1252 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 186 + 684 = 863 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 43 × 29 = 1241 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 35 × 12 = 421 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 49 × 28 = 1372 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 720 + 236 = 953 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 88 × 25 = 2203 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 66 × 33 = 2174 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 466 + 816 = 1289 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 14 × 28 = 391 right or wrong? (a) Wrong (b) Right

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