Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 184 · 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 148 + 744 = 892 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 20 × 38 = 757 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 44 × 19 = 839 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 44 × 99 = 4356 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 106 + 869 = 977 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 248 + 507 = 759 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 965 + 965 = 1930 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 89 × 44 = 3916 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 417 + 273 = 684 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 661 + 669 = 1328 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 54 × 48 = 2592 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 58 × 51 = 2955 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 76 × 20 = 1520 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 48 × 32 = 1533 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 49 × 32 = 1560 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 128 + 955 = 1080 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 98 × 97 = 9499 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 24 × 62 = 1494 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 896 + 467 = 1358 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 945 + 670 = 1615 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 21 × 25 = 520 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 16 × 85 = 1360 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 271 + 552 = 826 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 777 + 185 = 955 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 356 + 277 = 633 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 420 + 579 = 999 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 579 + 600 = 1173 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 49 × 37 = 1813 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 97 × 46 = 4462 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 873 + 990 = 1860 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 30 × 79 = 2370 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 236 + 112 = 343 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 479 + 406 = 890 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 270 + 190 = 460 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 27 × 19 = 513 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 64 × 50 = 3200 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 142 + 175 = 317 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 718 + 230 = 942 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 18 × 78 = 1404 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 14 × 77 = 1078 right or wrong? (a) Wrong (b) Right

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