Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 395 · 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 618 + 346 = 964 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 827 + 628 = 1455 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 73 × 62 = 4519 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 37 × 72 = 2670 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 34 × 50 = 1693 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 424 + 844 = 1259 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 598 + 898 = 1496 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 731 + 701 = 1433 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 370 + 111 = 481 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 222 + 739 = 953 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 24 × 52 = 1242 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 54 × 50 = 2692 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 67 × 55 = 3686 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 46 × 87 = 4002 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 848 + 930 = 1776 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 20 × 73 = 1460 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 962 + 376 = 1343 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 42 × 53 = 2224 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 710 + 460 = 1170 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 12 × 54 = 648 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 20 × 83 = 1665 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 89 × 80 = 7128 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 68 × 71 = 4837 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 79 × 12 = 948 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 365 + 820 = 1181 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 52 × 94 = 4893 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 58 × 68 = 3947 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 18 × 26 = 468 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 89 × 99 = 8805 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 36 × 94 = 3391 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 314 + 720 = 1029 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 905 + 298 = 1210 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 746 + 960 = 1699 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 840 + 670 = 1509 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 197 + 620 = 822 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 186 + 353 = 539 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 659 + 615 = 1274 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 142 + 939 = 1076 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 97 × 61 = 5919 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 15 × 42 = 639 right or wrong? (a) Right (b) Wrong

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