Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 380 · 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 75 × 74 = 5550 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 526 + 364 = 890 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 27 × 22 = 594 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 542 + 797 = 1342 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 428 + 723 = 1150 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 643 + 562 = 1214 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 207 + 789 = 1003 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 69 × 60 = 4134 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 69 × 72 = 4960 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 50 × 45 = 2250 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 548 + 684 = 1231 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 73 × 89 = 6504 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 23 × 20 = 460 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 21 × 60 = 1259 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 258 + 769 = 1025 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 57 × 28 = 1595 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 198 + 157 = 355 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 25 × 83 = 2068 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 51 × 84 = 4284 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 288 + 646 = 934 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 197 + 234 = 423 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 70 × 98 = 6863 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 50 × 55 = 2750 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 952 + 258 = 1208 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 117 + 717 = 827 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 83 × 30 = 2490 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 189 + 171 = 360 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 15 × 46 = 690 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 53 × 93 = 4929 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 12 × 19 = 229 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 696 + 421 = 1117 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 62 × 59 = 3660 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 226 + 496 = 731 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 39 × 68 = 2658 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 191 + 299 = 491 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 57 × 61 = 3477 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 18 × 54 = 974 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 139 + 622 = 770 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 133 + 222 = 355 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 73 × 45 = 3293 right or wrong? (a) Right (b) Wrong

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