Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 192 · 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 868 + 849 = 1724 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 98 × 15 = 1470 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 50 × 66 = 3293 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 82 × 16 = 1310 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 46 × 59 = 2714 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 197 + 531 = 732 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 668 + 882 = 1550 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 97 × 94 = 9113 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 14 × 41 = 579 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 50 × 75 = 3750 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 58 × 77 = 4466 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 95 × 65 = 6175 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 596 + 227 = 817 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 305 + 493 = 805 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 906 + 943 = 1849 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 91 × 83 = 7547 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 224 + 374 = 598 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 352 + 699 = 1051 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 62 × 17 = 1058 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 37 × 48 = 1776 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 20 × 33 = 664 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 507 + 540 = 1043 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 714 + 248 = 963 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 20 × 93 = 1860 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 143 + 633 = 776 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 591 + 447 = 1038 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 38 × 74 = 2812 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 499 + 483 = 974 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 394 + 237 = 628 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 519 + 566 = 1089 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 257 + 149 = 406 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 35 × 69 = 2415 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 86 × 17 = 1458 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 817 + 340 = 1157 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 177 + 708 = 885 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 606 + 167 = 769 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 796 + 155 = 946 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 105 + 314 = 417 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 21 × 31 = 652 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 48 × 44 = 2112 right or wrong? (a) Wrong (b) Right

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