Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 234 · 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 153 + 524 = 677 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 991 + 165 = 1149 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 518 + 187 = 705 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 22 × 68 = 1488 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 284 + 401 = 678 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 52 × 82 = 4264 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 52 × 23 = 1196 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 920 + 263 = 1183 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 346 + 856 = 1204 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 92 × 87 = 8004 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 51 × 79 = 4022 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 21 × 71 = 1494 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 568 + 527 = 1095 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 244 + 845 = 1089 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 138 + 601 = 739 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 666 + 442 = 1108 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 190 + 525 = 715 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 98 × 67 = 6566 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 469 + 156 = 618 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 686 + 757 = 1443 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 24 × 92 = 2217 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 354 + 117 = 469 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 35 × 31 = 1084 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 22 × 21 = 462 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 22 × 25 = 550 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 28 × 18 = 504 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 658 + 726 = 1384 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 32 × 34 = 1088 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 81 × 22 = 1782 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 497 + 826 = 1323 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 566 + 929 = 1500 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 73 × 19 = 1387 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 14 × 49 = 686 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 20 × 42 = 840 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 935 + 198 = 1136 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 65 × 99 = 6435 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 48 × 30 = 1440 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 771 + 983 = 1754 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 60 × 81 = 4860 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 150 + 419 = 567 right or wrong? (a) Right (b) Wrong

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