Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 57 · 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 32 × 86 = 2752 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 90 × 46 = 4136 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 95 × 14 = 1330 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 93 × 64 = 5958 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 849 + 190 = 1039 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 167 + 260 = 427 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 364 + 237 = 601 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 509 + 238 = 747 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 290 + 972 = 1253 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 327 + 184 = 510 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 212 + 133 = 345 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 21 × 16 = 336 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 564 + 788 = 1352 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 284 + 709 = 996 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 392 + 600 = 992 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 222 + 878 = 1107 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 559 + 351 = 910 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 734 + 671 = 1413 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 77 × 32 = 2464 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 91 × 18 = 1639 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 719 + 836 = 1558 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 611 + 206 = 817 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 63 × 92 = 5796 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 331 + 450 = 777 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 219 + 854 = 1073 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 122 + 176 = 298 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 95 × 95 = 9025 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 944 + 338 = 1282 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 371 + 657 = 1026 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 842 + 260 = 1097 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 214 + 784 = 995 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 781 + 168 = 947 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 60 × 21 = 1262 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 51 × 77 = 3925 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 39 × 17 = 660 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 44 × 16 = 700 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 351 + 201 = 552 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 141 + 135 = 276 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 64 × 51 = 3256 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 463 + 675 = 1135 right or wrong? (a) Wrong (b) Right

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