Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 966 · 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 712 + 905 = 1617 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 24 × 77 = 1848 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 520 + 467 = 987 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 143 + 121 = 264 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 999 + 927 = 1926 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 89 × 97 = 8633 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 722 + 201 = 929 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 60 × 23 = 1380 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 86 × 95 = 8170 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 14 × 93 = 1302 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 37 × 64 = 2377 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 81 × 70 = 5670 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 48 × 89 = 4272 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 57 × 17 = 964 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 91 × 15 = 1365 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 73 × 20 = 1460 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 308 + 916 = 1224 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 12 × 89 = 1068 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 416 + 768 = 1184 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 28 × 87 = 2436 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 508 + 342 = 850 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 60 × 38 = 2285 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 92 × 54 = 4965 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 748 + 290 = 1038 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 545 + 434 = 979 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 157 + 895 = 1052 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 819 + 558 = 1381 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 18 × 49 = 882 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 390 + 354 = 751 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 858 + 433 = 1282 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 608 + 353 = 961 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 514 + 523 = 1037 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 642 + 383 = 1025 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 40 × 16 = 649 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 62 × 59 = 3654 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 905 + 280 = 1178 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 884 + 251 = 1135 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 529 + 508 = 1046 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 79 × 97 = 7663 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 78 × 73 = 5688 right or wrong? (a) Right (b) Wrong

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