Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 73 · 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 30 × 99 = 2972 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 810 + 276 = 1079 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 16 × 34 = 544 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 99 × 21 = 2079 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 81 × 31 = 2511 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 596 + 455 = 1051 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 986 + 247 = 1233 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 363 + 331 = 694 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 694 + 976 = 1664 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 250 + 509 = 751 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 607 + 842 = 1442 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 74 × 22 = 1628 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 97 × 75 = 7275 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 56 × 56 = 3139 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 424 + 589 = 1013 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 95 × 19 = 1805 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 350 + 715 = 1074 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 12 × 88 = 1056 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 374 + 862 = 1236 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 65 × 99 = 6435 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 65 × 81 = 5265 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 73 × 91 = 6641 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 44 × 31 = 1364 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 744 + 804 = 1546 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 15 × 53 = 795 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 44 × 57 = 2508 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 43 × 54 = 2327 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 81 × 54 = 4374 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 292 + 178 = 463 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 90 × 55 = 4953 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 224 + 864 = 1087 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 164 + 445 = 609 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 396 + 265 = 661 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 51 × 57 = 2907 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 285 + 608 = 896 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 247 + 843 = 1091 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 97 × 64 = 6208 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 684 + 596 = 1280 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 66 × 28 = 1848 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 86 × 43 = 3698 right or wrong? (a) Wrong (b) Right

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