Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 862 · 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 165 + 480 = 645 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 43 × 85 = 3655 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 949 + 668 = 1621 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 45 × 89 = 4005 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 179 + 418 = 592 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 87 × 85 = 7395 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 27 × 34 = 918 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 19 × 25 = 483 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 601 + 780 = 1381 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 44 × 51 = 2251 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 702 + 333 = 1035 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 834 + 478 = 1309 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 42 × 15 = 630 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 167 + 680 = 852 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 43 × 23 = 989 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 60 × 84 = 5049 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 492 + 972 = 1464 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 19 × 68 = 1289 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 96 × 67 = 6432 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 87 × 13 = 1131 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 232 + 871 = 1106 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 42 × 36 = 1521 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 46 × 17 = 786 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 275 + 576 = 851 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 77 × 31 = 2390 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 89 × 15 = 1335 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 978 + 792 = 1771 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 207 + 815 = 1022 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 54 × 16 = 862 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 789 + 265 = 1052 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 30 × 78 = 2340 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 134 + 111 = 240 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 153 + 503 = 656 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 21 × 68 = 1428 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 258 + 470 = 720 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 84 × 45 = 3780 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 78 × 97 = 7570 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 366 + 690 = 1056 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 374 + 245 = 617 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 65 × 70 = 4548 right or wrong? (a) Right (b) Wrong

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