Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 728 · 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 233 + 564 = 797 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 812 + 111 = 923 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 94 × 37 = 3485 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 719 + 511 = 1230 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 915 + 193 = 1107 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 74 × 87 = 6433 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 575 + 761 = 1344 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 189 + 575 = 760 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 45 × 44 = 1980 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 22 × 58 = 1276 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 343 + 977 = 1320 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 33 × 60 = 1976 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 19 × 66 = 1254 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 967 + 773 = 1740 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 217 + 584 = 801 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 67 × 71 = 4757 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 54 × 27 = 1454 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 39 × 16 = 629 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 93 × 54 = 5020 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 62 × 16 = 992 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 27 × 97 = 2623 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 557 + 734 = 1291 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 64 × 63 = 4032 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 355 + 352 = 707 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 16 × 57 = 912 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 759 + 892 = 1643 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 97 × 41 = 3977 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 66 × 55 = 3628 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 69 × 30 = 2070 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 50 × 33 = 1641 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 830 + 537 = 1367 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 676 + 368 = 1046 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 65 × 54 = 3515 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 212 + 765 = 980 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 27 × 20 = 540 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 416 + 524 = 934 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 762 + 199 = 961 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 74 × 43 = 3183 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 66 × 17 = 1122 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 50 × 80 = 3993 right or wrong? (a) Wrong (b) Right

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