Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 372 · 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 12 × 17 = 212 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 904 + 187 = 1086 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 61 × 23 = 1403 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 23 × 43 = 989 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 56 × 89 = 4986 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 16 × 57 = 908 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 95 × 37 = 3515 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 33 × 62 = 2037 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 946 + 359 = 1308 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 83 × 88 = 7302 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 27 × 70 = 1888 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 49 × 73 = 3577 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 37 × 46 = 1702 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 846 + 564 = 1414 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 86 × 89 = 7657 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 93 × 81 = 7532 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 32 × 12 = 383 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 291 + 810 = 1092 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 86 × 76 = 6530 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 600 + 210 = 810 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 729 + 368 = 1092 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 533 + 889 = 1422 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 158 + 459 = 620 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 702 + 641 = 1343 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 432 + 515 = 947 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 187 + 662 = 849 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 77 × 36 = 2767 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 547 + 880 = 1427 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 28 × 54 = 1515 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 541 + 299 = 837 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 34 × 66 = 2253 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 307 + 739 = 1046 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 98 × 30 = 2940 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 42 × 61 = 2558 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 89 × 12 = 1065 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 868 + 272 = 1140 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 684 + 733 = 1417 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 35 × 95 = 3325 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 22 × 71 = 1558 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 181 + 398 = 575 right or wrong? (a) Wrong (b) Right

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