Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 748 · 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 77 × 87 = 6699 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 749 + 815 = 1564 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 513 + 679 = 1196 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 778 + 329 = 1102 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 395 + 235 = 630 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 553 + 613 = 1166 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 281 + 656 = 943 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 176 + 492 = 675 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 595 + 182 = 777 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 54 × 23 = 1242 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 79 × 26 = 2054 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 951 + 463 = 1415 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 548 + 708 = 1256 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 81 × 74 = 5987 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 81 × 25 = 2021 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 69 × 82 = 5663 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 82 × 48 = 3929 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 99 × 48 = 4757 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 505 + 730 = 1229 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 889 + 921 = 1810 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 85 × 88 = 7480 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 39 × 18 = 705 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 86 × 32 = 2750 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 672 + 883 = 1555 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 542 + 333 = 877 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 71 × 24 = 1699 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 97 × 20 = 1940 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 407 + 964 = 1369 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 877 + 744 = 1621 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 292 + 732 = 1024 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 602 + 663 = 1257 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 564 + 179 = 743 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 58 × 36 = 2088 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 393 + 397 = 783 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 84 × 93 = 7812 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 794 + 226 = 1020 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 19 × 19 = 363 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 84 × 21 = 1761 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 28 × 64 = 1792 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 25 × 27 = 670 right or wrong? (a) Right (b) Wrong

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