Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 408 · 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 × 52 = 1560 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 56 × 31 = 1736 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 939 + 776 = 1712 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 81 × 37 = 2997 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 76 × 53 = 4028 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 339 + 139 = 478 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 831 + 152 = 983 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 52 × 53 = 2747 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 97 × 33 = 3201 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 92 × 93 = 8549 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 932 + 989 = 1923 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 93 × 47 = 4374 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 26 × 96 = 2502 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 994 + 301 = 1304 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 15 × 27 = 411 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 884 + 678 = 1562 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 50 × 46 = 2292 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 12 × 78 = 936 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 83 × 83 = 6889 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 51 × 25 = 1275 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 578 + 638 = 1218 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 461 + 844 = 1310 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 638 + 122 = 760 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 75 × 76 = 5709 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 95 × 19 = 1805 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 37 × 25 = 934 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 84 × 93 = 7814 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 12 × 20 = 240 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 205 + 946 = 1152 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 878 + 531 = 1408 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 302 + 227 = 529 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 67 × 36 = 2412 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 73 × 26 = 1898 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 289 + 677 = 968 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 109 + 870 = 979 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 22 × 93 = 2046 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 472 + 417 = 884 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 363 + 135 = 498 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 69 × 16 = 1106 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 81 × 88 = 7129 right or wrong? (a) Right (b) Wrong

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