Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 991 · 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 58 × 60 = 3480 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 92 × 19 = 1748 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 28 × 47 = 1316 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 64 × 25 = 1600 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 517 + 519 = 1042 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 24 × 76 = 1824 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 70 × 14 = 980 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 59 × 52 = 3068 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 47 × 16 = 752 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 79 × 27 = 2133 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 29 × 65 = 1885 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 42 × 34 = 1434 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 45 × 92 = 4133 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 62 × 51 = 3156 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 993 + 578 = 1576 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 49 × 60 = 2947 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 13 × 48 = 623 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 44 × 76 = 3340 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 499 + 791 = 1290 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 20 × 33 = 659 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 804 + 343 = 1147 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 16 × 73 = 1168 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 465 + 134 = 599 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 629 + 799 = 1428 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 59 × 64 = 3776 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 16 × 53 = 848 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 436 + 362 = 793 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 709 + 300 = 1009 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 48 × 94 = 4512 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 22 × 55 = 1210 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 637 + 792 = 1429 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 880 + 785 = 1665 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 29 × 12 = 348 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 966 + 188 = 1156 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 956 + 300 = 1256 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 656 + 886 = 1536 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 27 × 36 = 965 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 12 × 92 = 1096 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 208 + 726 = 937 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 99 × 69 = 6832 right or wrong? (a) Right (b) Wrong

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