Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 929 · 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 82 × 98 = 8035 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 20 × 48 = 960 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 206 + 282 = 488 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 80 × 73 = 5840 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 609 + 618 = 1218 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 91 × 33 = 3003 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 809 + 906 = 1718 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 28 × 17 = 468 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 95 × 95 = 9030 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 18 × 36 = 648 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 582 + 282 = 867 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 47 × 34 = 1597 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 54 × 85 = 4593 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 80 × 27 = 2158 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 676 + 348 = 1024 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 85 × 90 = 7647 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 275 + 292 = 562 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 13 × 95 = 1232 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 423 + 537 = 960 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 64 × 23 = 1467 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 15 × 57 = 850 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 97 × 26 = 2514 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 30 × 29 = 875 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 52 × 37 = 1924 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 646 + 262 = 901 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 934 + 743 = 1685 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 152 + 294 = 437 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 84 × 62 = 5214 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 40 × 84 = 3359 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 23 × 63 = 1447 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 50 × 85 = 4250 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 172 + 271 = 443 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 37 × 84 = 3108 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 60 × 15 = 900 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 36 × 56 = 2016 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 41 × 77 = 3160 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 96 × 71 = 6825 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 28 × 70 = 1960 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 80 × 72 = 5763 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 53 × 40 = 2120 right or wrong? (a) Right (b) Wrong

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