Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 121 · 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 18 × 87 = 1573 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 23 × 47 = 1085 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 667 + 602 = 1269 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 268 + 404 = 672 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 98 × 23 = 2260 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 68 × 96 = 6528 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 72 × 54 = 3880 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 80 × 43 = 3440 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 82 × 60 = 4912 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 32 × 16 = 513 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 64 × 95 = 6080 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 639 + 765 = 1404 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 598 + 346 = 944 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 601 + 960 = 1564 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 40 × 54 = 2169 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 461 + 882 = 1344 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 778 + 479 = 1257 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 79 × 83 = 6549 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 171 + 390 = 561 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 37 × 32 = 1184 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 76 × 25 = 1900 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 34 × 65 = 2210 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 519 + 979 = 1498 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 24 × 41 = 985 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 369 + 776 = 1139 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 510 + 393 = 903 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 20 × 56 = 1120 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 94 × 47 = 4417 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 532 + 220 = 761 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 741 + 877 = 1623 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 87 × 18 = 1566 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 40 × 20 = 797 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 693 + 623 = 1325 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 37 × 97 = 3581 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 58 × 89 = 5153 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 794 + 139 = 933 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 789 + 191 = 980 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 314 + 979 = 1288 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 54 × 54 = 2923 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 49 × 92 = 4501 right or wrong? (a) Wrong (b) Right

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