Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 529 · 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 218 + 530 = 755 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 36 × 74 = 2664 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 36 × 13 = 468 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 445 + 508 = 949 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 18 × 32 = 573 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 709 + 345 = 1054 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 86 × 83 = 7138 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 22 × 78 = 1715 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 142 + 334 = 476 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 69 × 77 = 5312 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 760 + 681 = 1444 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 814 + 753 = 1576 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 743 + 330 = 1073 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 386 + 608 = 994 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 655 + 315 = 970 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 43 × 29 = 1238 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 65 × 82 = 5326 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 252 + 274 = 526 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 393 + 242 = 626 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 895 + 545 = 1436 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 18 × 29 = 522 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 48 × 31 = 1488 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 86 × 32 = 2758 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 143 + 371 = 515 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 762 + 949 = 1705 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 85 × 64 = 5440 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 214 + 222 = 430 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 946 + 836 = 1787 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 930 + 947 = 1876 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 85 × 69 = 5865 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 92 × 97 = 8931 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 34 × 41 = 1397 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 615 + 211 = 826 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 40 × 12 = 480 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 75 × 32 = 2400 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 23 × 22 = 509 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 42 × 59 = 2478 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 32 × 80 = 2565 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 509 + 735 = 1245 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 23 × 34 = 786 right or wrong? (a) Right (b) Wrong

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