Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 801 · 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 82 × 30 = 2452 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 323 + 398 = 729 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 580 + 222 = 805 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 54 × 62 = 3346 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 89 × 31 = 2764 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 724 + 778 = 1502 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 862 + 925 = 1787 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 891 + 690 = 1577 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 778 + 569 = 1347 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 77 × 19 = 1472 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 928 + 843 = 1768 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 726 + 799 = 1528 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 15 × 35 = 525 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 277 + 822 = 1099 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 48 × 84 = 4039 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 35 × 89 = 3119 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 114 + 292 = 406 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 107 + 937 = 1047 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 54 × 55 = 2970 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 49 × 55 = 2702 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 70 × 27 = 1892 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 41 × 96 = 3936 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 216 + 494 = 710 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 33 × 26 = 852 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 37 × 76 = 2820 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 32 × 48 = 1536 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 44 × 13 = 572 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 313 + 539 = 852 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 814 + 235 = 1049 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 52 × 88 = 4583 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 43 × 87 = 3735 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 84 × 74 = 6209 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 50 × 80 = 3998 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 48 × 78 = 3752 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 153 + 718 = 871 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 235 + 351 = 580 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 86 × 41 = 3526 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 512 + 431 = 943 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 827 + 624 = 1445 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 86 × 79 = 6794 right or wrong? (a) Right (b) Wrong

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