Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 213 · 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 37 × 20 = 740 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 97 × 77 = 7469 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 42 × 18 = 749 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 285 + 808 = 1093 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 17 × 26 = 442 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 65 × 35 = 2275 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 108 + 149 = 251 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 52 × 90 = 4680 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 28 × 67 = 1870 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 457 + 176 = 633 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 82 × 63 = 5166 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 497 + 731 = 1225 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 62 × 59 = 3658 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 40 × 31 = 1247 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 24 × 38 = 912 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 42 × 85 = 3570 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 185 + 600 = 785 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 717 + 509 = 1226 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 315 + 780 = 1095 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 57 × 38 = 2166 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 21 × 68 = 1428 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 27 × 33 = 891 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 652 + 954 = 1606 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 455 + 817 = 1272 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 64 × 43 = 2752 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 60 × 81 = 4855 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 117 + 852 = 961 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 23 × 47 = 1081 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 17 × 84 = 1428 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 567 + 955 = 1515 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 109 + 379 = 488 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 735 + 530 = 1265 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 932 + 935 = 1873 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 64 × 86 = 5504 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 425 + 856 = 1281 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 709 + 157 = 866 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 33 × 37 = 1221 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 42 × 30 = 1260 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 29 × 24 = 690 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 504 + 436 = 946 right or wrong? (a) Wrong (b) Right

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