Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 833 · 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 83 × 73 = 6059 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 67 × 34 = 2286 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 53 × 78 = 4134 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 944 + 287 = 1231 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 82 × 31 = 2535 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 20 × 44 = 876 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 956 + 800 = 1761 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 494 + 587 = 1088 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 62 × 93 = 5765 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 13 × 92 = 1196 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 618 + 108 = 718 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 604 + 866 = 1473 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 62 × 58 = 3596 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 77 × 74 = 5698 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 85 × 21 = 1785 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 376 + 647 = 1023 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 26 × 29 = 754 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 769 + 160 = 927 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 545 + 642 = 1187 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 634 + 986 = 1620 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 27 × 17 = 455 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 90 × 71 = 6390 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 524 + 513 = 1043 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 84 × 70 = 5887 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 42 × 50 = 2100 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 45 × 32 = 1449 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 77 × 17 = 1303 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 481 + 557 = 1033 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 353 + 872 = 1225 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 332 + 179 = 511 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 69 × 30 = 2070 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 18 × 16 = 288 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 56 × 74 = 4151 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 62 × 88 = 5456 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 51 × 18 = 918 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 70 × 89 = 6230 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 68 × 32 = 2178 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 24 × 92 = 2208 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 792 + 591 = 1383 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 18 × 92 = 1662 right or wrong? (a) Right (b) Wrong

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