Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 576 · 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 14 × 98 = 1379 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 27 × 82 = 2214 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 71 × 64 = 4540 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 18 × 53 = 957 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 759 + 147 = 903 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 49 × 54 = 2646 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 49 × 36 = 1762 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 78 × 47 = 3666 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 998 + 690 = 1688 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 93 × 52 = 4831 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 806 + 622 = 1428 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 408 + 704 = 1112 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 731 + 889 = 1615 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 782 + 572 = 1354 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 887 + 728 = 1615 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 19 × 48 = 912 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 98 × 38 = 3724 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 19 × 91 = 1729 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 12 × 79 = 948 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 83 × 32 = 2656 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 23 × 19 = 446 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 267 + 816 = 1090 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 171 + 125 = 296 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 494 + 571 = 1065 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 47 × 55 = 2585 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 38 × 21 = 798 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 768 + 443 = 1220 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 699 + 479 = 1178 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 711 + 331 = 1034 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 18 × 19 = 344 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 42 × 52 = 2181 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 303 + 974 = 1285 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 946 + 879 = 1818 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 34 × 69 = 2341 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 55 × 68 = 3740 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 84 × 36 = 3024 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 328 + 784 = 1112 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 44 × 88 = 3872 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 551 + 431 = 982 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 882 + 298 = 1178 right or wrong? (a) Wrong (b) Right

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