Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 259 · 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 19 × 13 = 247 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 48 × 23 = 1110 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 22 × 30 = 660 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 55 × 95 = 5224 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 32 × 20 = 640 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 664 + 315 = 977 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 965 + 327 = 1292 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 835 + 125 = 963 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 68 × 38 = 2584 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 641 + 132 = 773 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 74 × 17 = 1250 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 79 × 95 = 7505 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 85 × 87 = 7389 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 157 + 744 = 901 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 46 × 51 = 2338 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 784 + 428 = 1212 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 63 × 35 = 2205 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 44 × 57 = 2502 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 18 × 74 = 1332 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 68 × 77 = 5227 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 51 × 60 = 3058 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 17 × 13 = 212 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 56 × 39 = 2181 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 801 + 923 = 1717 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 450 + 410 = 851 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 167 + 151 = 318 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 29 × 99 = 2871 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 26 × 37 = 956 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 54 × 90 = 4860 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 774 + 486 = 1266 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 604 + 958 = 1562 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 70 × 80 = 5600 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 958 + 927 = 1884 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 34 × 84 = 2856 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 55 × 71 = 3905 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 33 × 79 = 2607 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 65 × 48 = 3129 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 375 + 965 = 1341 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 91 × 97 = 8827 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 202 + 446 = 644 right or wrong? (a) Right (b) Wrong

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