Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 91 · 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 41 × 39 = 1600 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 33 × 83 = 2738 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 48 × 91 = 4372 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 22 × 73 = 1606 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 652 + 585 = 1240 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 21 × 39 = 819 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 98 × 73 = 7154 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 319 + 129 = 447 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 84 × 32 = 2688 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 254 + 595 = 849 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 17 × 78 = 1325 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 340 + 318 = 650 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 795 + 788 = 1583 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 296 + 775 = 1071 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 680 + 485 = 1167 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 95 × 18 = 1707 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 79 × 68 = 5372 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 770 + 267 = 1037 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 48 × 12 = 576 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 979 + 455 = 1437 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 70 × 81 = 5676 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 64 × 13 = 832 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 76 × 48 = 3648 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 91 × 35 = 3190 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 675 + 680 = 1355 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 661 + 217 = 878 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 485 + 726 = 1211 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 31 × 85 = 2635 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 400 + 531 = 931 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 405 + 964 = 1368 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 47 × 84 = 3948 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 32 × 83 = 2656 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 307 + 471 = 786 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 92 × 17 = 1557 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 506 + 506 = 1006 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 421 + 389 = 810 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 90 × 22 = 1980 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 63 × 72 = 4536 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 30 × 98 = 2940 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 28 × 93 = 2604 right or wrong? (a) Right (b) Wrong

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