Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 388 · 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 25 × 85 = 2124 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 910 + 571 = 1480 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 80 × 42 = 3358 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 53 × 26 = 1386 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 777 + 234 = 1011 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 338 + 344 = 679 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 492 + 293 = 783 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 18 × 45 = 810 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 558 + 737 = 1302 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 119 + 925 = 1044 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 433 + 319 = 752 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 285 + 859 = 1144 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 559 + 322 = 879 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 532 + 328 = 861 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 55 × 13 = 715 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 272 + 163 = 438 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 64 × 32 = 2048 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 828 + 564 = 1392 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 44 × 47 = 2065 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 168 + 265 = 439 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 438 + 662 = 1094 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 40 × 19 = 760 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 78 × 25 = 1950 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 497 + 105 = 593 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 88 × 74 = 6518 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 706 + 449 = 1155 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 893 + 792 = 1685 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 97 × 53 = 5141 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 348 + 467 = 815 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 71 × 43 = 3056 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 282 + 829 = 1103 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 81 × 64 = 5184 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 240 + 320 = 560 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 329 + 761 = 1088 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 183 + 345 = 528 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 789 + 870 = 1658 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 35 × 51 = 1785 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 27 × 14 = 378 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 167 + 131 = 300 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 140 + 504 = 644 right or wrong? (a) Right (b) Wrong

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