Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 203 · 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 65 × 61 = 3965 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 513 + 256 = 769 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 829 + 605 = 1436 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 51 × 90 = 4583 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 81 × 23 = 1863 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 28 × 76 = 2128 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 56 × 26 = 1448 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 27 × 42 = 1132 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 26 × 29 = 754 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 47 × 47 = 2202 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 54 × 12 = 648 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 146 + 745 = 891 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 548 + 703 = 1244 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 297 + 360 = 660 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 275 + 154 = 429 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 887 + 514 = 1402 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 342 + 113 = 455 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 927 + 184 = 1111 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 850 + 122 = 965 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 25 × 15 = 375 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 880 + 247 = 1130 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 286 + 424 = 710 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 22 × 26 = 566 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 43 × 18 = 774 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 49 × 42 = 2053 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 812 + 665 = 1480 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 749 + 321 = 1066 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 348 + 508 = 856 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 68 × 53 = 3604 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 240 + 686 = 926 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 415 + 248 = 663 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 94 × 82 = 7699 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 126 + 669 = 793 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 47 × 35 = 1645 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 309 + 623 = 932 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 18 × 45 = 815 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 705 + 254 = 959 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 21 × 50 = 1050 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 75 × 43 = 3221 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 57 × 51 = 2907 right or wrong? (a) Right (b) Wrong

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