Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 705 · 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 91 × 31 = 2821 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 80 × 30 = 2400 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 96 × 94 = 9024 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 925 + 400 = 1332 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 48 × 46 = 2208 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 307 + 650 = 963 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 61 × 47 = 2867 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 800 + 386 = 1186 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 70 × 13 = 910 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 756 + 297 = 1058 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 24 × 49 = 1172 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 134 + 661 = 791 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 525 + 561 = 1086 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 144 + 855 = 1002 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 60 × 14 = 840 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 88 × 56 = 4935 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 460 + 367 = 827 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 34 × 28 = 950 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 30 × 32 = 960 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 74 × 28 = 2072 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 90 × 21 = 1890 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 235 + 678 = 913 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 899 + 539 = 1445 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 242 + 271 = 513 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 81 × 19 = 1537 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 651 + 884 = 1535 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 15 × 16 = 241 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 162 + 108 = 266 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 38 × 20 = 756 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 30 × 95 = 2850 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 40 × 59 = 2360 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 74 × 23 = 1700 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 903 + 480 = 1383 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 88 × 94 = 8278 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 140 + 471 = 611 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 190 + 694 = 879 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 79 × 83 = 6557 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 716 + 355 = 1071 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 77 × 43 = 3309 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 350 + 420 = 770 right or wrong? (a) Right (b) Wrong

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