Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 810 · 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 12 × 18 = 211 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 65 × 79 = 5135 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 68 × 95 = 6469 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 37 × 39 = 1444 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 821 + 199 = 1027 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 358 + 479 = 839 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 915 + 663 = 1583 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 264 + 769 = 1033 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 213 + 946 = 1154 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 43 × 67 = 2882 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 78 × 60 = 4680 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 966 + 541 = 1515 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 883 + 766 = 1657 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 58 × 54 = 3132 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 333 + 945 = 1286 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 612 + 164 = 774 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 530 + 890 = 1420 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 706 + 946 = 1655 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 62 × 94 = 5837 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 60 × 13 = 780 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 135 + 558 = 693 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 37 × 18 = 671 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 575 + 735 = 1308 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 402 + 810 = 1212 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 664 + 793 = 1449 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 75 × 89 = 6675 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 755 + 312 = 1067 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 16 × 39 = 624 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 74 × 21 = 1552 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 257 + 740 = 996 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 331 + 543 = 877 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 284 + 507 = 791 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 69 × 25 = 1717 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 481 + 877 = 1358 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 775 + 516 = 1291 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 94 × 17 = 1591 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 919 + 709 = 1627 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 391 + 141 = 535 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 236 + 408 = 644 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 76 × 87 = 6612 right or wrong? (a) Wrong (b) Right

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