Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 367 · 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 26 × 27 = 702 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 30 × 35 = 1050 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 616 + 979 = 1595 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 52 × 78 = 4056 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 64 × 53 = 3386 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 766 + 895 = 1670 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 88 × 54 = 4752 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 427 + 130 = 557 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 67 × 30 = 2009 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 22 × 14 = 303 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 62 × 55 = 3410 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 19 × 96 = 1824 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 374 + 358 = 732 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 18 × 25 = 450 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 54 × 29 = 1566 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 250 + 141 = 399 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 484 + 853 = 1337 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 82 × 40 = 3280 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 41 × 89 = 3654 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 21 × 99 = 2079 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 54 × 58 = 3132 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 270 + 712 = 983 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 984 + 919 = 1903 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 12 × 16 = 192 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 236 + 953 = 1189 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 53 × 77 = 4081 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 821 + 341 = 1163 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 717 + 876 = 1586 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 30 × 76 = 2280 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 616 + 907 = 1523 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 21 × 31 = 651 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 32 × 93 = 2983 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 437 + 128 = 569 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 189 + 567 = 756 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 32 × 73 = 2331 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 774 + 400 = 1175 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 38 × 33 = 1260 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 712 + 349 = 1061 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 659 + 901 = 1563 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 194 + 461 = 655 right or wrong? (a) Wrong (b) Right

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