Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 922 · 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 97 × 18 = 1750 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 66 × 41 = 2706 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 61 × 33 = 2008 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 83 × 63 = 5221 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 658 + 988 = 1646 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 74 × 61 = 4514 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 90 × 83 = 7466 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 77 × 43 = 3303 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 823 + 185 = 1001 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 140 + 972 = 1112 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 621 + 713 = 1334 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 64 × 73 = 4663 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 30 × 39 = 1170 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 35 × 51 = 1785 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 90 × 89 = 8010 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 773 + 257 = 1030 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 45 × 38 = 1711 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 73 × 22 = 1606 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 96 × 75 = 7205 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 963 + 631 = 1594 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 923 + 685 = 1608 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 27 × 57 = 1539 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 73 × 31 = 2263 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 860 + 351 = 1211 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 629 + 298 = 927 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 18 × 19 = 342 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 17 × 40 = 671 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 230 + 188 = 413 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 21 × 41 = 861 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 358 + 438 = 796 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 334 + 201 = 543 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 32 × 73 = 2340 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 31 × 62 = 1922 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 18 × 37 = 664 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 497 + 866 = 1356 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 92 × 13 = 1196 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 985 + 294 = 1279 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 580 + 938 = 1510 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 38 × 63 = 2394 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 99 × 90 = 8910 right or wrong? (a) Right (b) Wrong

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