Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 180 · 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 47 × 37 = 1737 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 25 × 35 = 880 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 85 × 12 = 1016 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 18 × 32 = 576 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 27 × 60 = 1620 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 55 × 88 = 4840 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 69 × 21 = 1448 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 507 + 518 = 1025 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 61 × 75 = 4572 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 41 × 23 = 943 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 75 × 93 = 6976 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 543 + 559 = 1101 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 724 + 419 = 1143 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 72 × 92 = 6624 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 653 + 721 = 1374 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 12 × 91 = 1092 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 75 × 73 = 5475 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 978 + 339 = 1317 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 78 × 14 = 1085 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 53 × 87 = 4611 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 875 + 185 = 1060 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 60 × 59 = 3539 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 38 × 28 = 1064 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 47 × 28 = 1307 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 87 × 55 = 4785 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 620 + 705 = 1318 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 681 + 430 = 1102 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 33 × 76 = 2506 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 357 + 241 = 598 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 26 × 57 = 1478 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 650 + 264 = 905 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 24 × 65 = 1560 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 37 × 58 = 2143 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 27 × 20 = 540 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 79 × 48 = 3792 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 123 + 353 = 473 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 19 × 26 = 494 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 70 × 53 = 3710 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 309 + 189 = 495 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 80 × 29 = 2326 right or wrong? (a) Wrong (b) Right

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