Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 504 · 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 97 × 27 = 2619 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 15 × 68 = 1017 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 15 × 67 = 996 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 96 × 65 = 6236 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 65 × 74 = 4810 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 33 × 41 = 1354 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 218 + 340 = 558 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 159 + 239 = 390 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 71 × 92 = 6528 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 23 × 73 = 1679 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 256 + 113 = 369 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 252 + 425 = 668 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 410 + 382 = 792 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 284 + 220 = 504 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 71 × 53 = 3763 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 93 × 45 = 4185 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 152 + 524 = 668 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 203 + 638 = 841 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 61 × 52 = 3176 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 376 + 673 = 1049 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 66 × 43 = 2838 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 246 + 449 = 703 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 37 × 41 = 1517 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 438 + 786 = 1224 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 150 + 753 = 903 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 65 × 75 = 4874 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 156 + 122 = 278 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 97 × 12 = 1160 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 96 × 26 = 2497 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 25 × 17 = 417 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 15 × 94 = 1410 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 353 + 479 = 826 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 71 × 13 = 914 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 64 × 21 = 1345 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 120 + 731 = 859 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 136 + 601 = 736 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 37 × 40 = 1480 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 53 × 40 = 2120 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 22 × 39 = 858 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 35 × 60 = 2108 right or wrong? (a) Right (b) Wrong

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