Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 333 · 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 693 + 110 = 803 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 19 × 87 = 1653 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 141 + 927 = 1068 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 162 + 483 = 646 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 729 + 706 = 1444 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 27 × 80 = 2157 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 541 + 232 = 773 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 903 + 378 = 1272 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 60 × 74 = 4440 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 34 × 47 = 1598 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 83 × 84 = 6972 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 617 + 232 = 846 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 77 × 14 = 1078 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 388 + 182 = 561 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 735 + 181 = 916 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 187 + 999 = 1183 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 16 × 18 = 285 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 35 × 97 = 3403 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 30 × 92 = 2766 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 492 + 885 = 1379 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 446 + 719 = 1165 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 58 × 60 = 3480 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 182 + 741 = 916 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 94 × 64 = 6016 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 210 + 201 = 413 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 462 + 574 = 1036 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 316 + 203 = 519 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 348 + 931 = 1279 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 191 + 119 = 310 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 84 × 82 = 6888 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 848 + 869 = 1717 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 277 + 168 = 440 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 91 × 71 = 6461 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 675 + 411 = 1086 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 88 × 83 = 7304 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 70 × 85 = 5950 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 53 × 57 = 3027 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 22 × 39 = 858 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 249 + 236 = 485 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 31 × 40 = 1240 right or wrong? (a) Right (b) Wrong

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