Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 820 · 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 71 × 15 = 1058 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 82 × 76 = 6228 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 51 × 30 = 1533 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 30 × 62 = 1862 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 93 × 85 = 7901 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 781 + 152 = 933 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 99 × 20 = 1972 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 15 × 59 = 885 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 495 + 419 = 923 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 785 + 530 = 1315 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 14 × 83 = 1169 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 51 × 51 = 2601 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 887 + 931 = 1818 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 65 × 85 = 5525 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 120 + 679 = 799 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 402 + 187 = 595 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 67 × 58 = 3881 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 84 × 96 = 8058 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 29 × 68 = 1972 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 628 + 885 = 1513 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 32 × 52 = 1664 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 875 + 548 = 1423 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 90 × 15 = 1350 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 87 × 58 = 5046 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 278 + 734 = 1012 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 176 + 702 = 878 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 52 × 60 = 3117 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 179 + 644 = 823 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 77 × 36 = 2775 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 232 + 277 = 504 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 52 × 92 = 4784 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 509 + 758 = 1266 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 25 × 14 = 350 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 99 × 24 = 2376 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 284 + 308 = 592 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 121 + 265 = 386 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 144 + 178 = 317 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 29 × 41 = 1189 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 87 × 52 = 4524 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 254 + 181 = 429 right or wrong? (a) Wrong (b) Right

Free maths tricks lessons, practice and worksheets at talentjr.in/maths-tricks