Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 52 · 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 55 × 30 = 1656 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 878 + 107 = 982 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 651 + 331 = 983 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 273 + 105 = 371 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 52 × 78 = 4061 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 87 × 30 = 2610 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 19 × 26 = 486 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 54 × 57 = 3078 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 705 + 999 = 1704 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 513 + 709 = 1222 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 634 + 831 = 1462 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 553 + 400 = 953 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 35 × 27 = 945 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 42 × 89 = 3738 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 549 + 714 = 1263 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 747 + 361 = 1108 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 157 + 487 = 644 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 29 × 66 = 1914 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 674 + 498 = 1164 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 353 + 224 = 577 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 151 + 625 = 776 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 651 + 122 = 776 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 150 + 708 = 858 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 458 + 577 = 1035 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 200 + 270 = 472 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 44 × 28 = 1232 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 568 + 731 = 1299 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 93 × 25 = 2319 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 17 × 58 = 986 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 287 + 297 = 575 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 70 × 72 = 5040 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 94 × 89 = 8366 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 92 × 35 = 3220 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 735 + 363 = 1098 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 97 × 82 = 7954 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 15 × 70 = 1050 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 61 × 56 = 3416 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 61 × 14 = 854 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 977 + 272 = 1252 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 353 + 746 = 1101 right or wrong? (a) Wrong (b) Right

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