Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 526 · 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 176 + 473 = 647 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 201 + 801 = 996 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 38 × 45 = 1710 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 34 × 20 = 680 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 70 × 53 = 3710 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 732 + 442 = 1165 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 97 × 22 = 2134 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 83 × 96 = 7977 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 262 + 387 = 645 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 692 + 335 = 1027 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 303 + 880 = 1176 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 17 × 34 = 578 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 30 × 57 = 1710 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 49 × 83 = 4070 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 12 × 86 = 1027 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 80 × 35 = 2798 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 31 × 47 = 1457 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 60 × 48 = 2878 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 95 × 71 = 6743 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 41 × 12 = 492 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 18 × 15 = 261 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 785 + 212 = 997 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 451 + 876 = 1327 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 97 × 95 = 9215 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 856 + 932 = 1788 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 780 + 155 = 934 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 33 × 12 = 396 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 274 + 206 = 477 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 544 + 123 = 667 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 947 + 847 = 1796 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 53 × 24 = 1272 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 894 + 493 = 1386 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 92 × 68 = 6256 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 71 × 82 = 5822 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 70 × 57 = 3990 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 502 + 315 = 814 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 42 × 83 = 3486 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 338 + 321 = 665 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 414 + 248 = 662 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 649 + 542 = 1191 right or wrong? (a) Right (b) Wrong

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