Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 614 · 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 96 × 20 = 1912 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 69 × 56 = 3868 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 402 + 921 = 1323 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 769 + 318 = 1093 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 282 + 933 = 1217 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 863 + 564 = 1430 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 746 + 856 = 1602 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 373 + 168 = 541 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 654 + 459 = 1108 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 755 + 922 = 1677 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 75 × 57 = 4275 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 926 + 690 = 1616 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 503 + 991 = 1494 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 42 × 48 = 2016 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 52 × 21 = 1092 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 281 + 336 = 609 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 154 + 368 = 522 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 59 × 92 = 5428 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 29 × 39 = 1131 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 29 × 16 = 464 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 15 × 35 = 517 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 12 × 67 = 804 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 274 + 117 = 394 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 781 + 343 = 1124 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 64 × 31 = 1984 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 311 + 606 = 913 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 600 + 934 = 1534 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 33 × 84 = 2772 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 38 × 16 = 605 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 53 × 19 = 1007 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 81 × 23 = 1862 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 371 + 652 = 1023 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 992 + 401 = 1393 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 77 × 69 = 5313 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 783 + 368 = 1152 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 751 + 158 = 918 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 35 × 18 = 630 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 428 + 241 = 669 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 827 + 261 = 1086 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 741 + 683 = 1424 right or wrong? (a) Right (b) Wrong

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