Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 719 · 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 191 + 383 = 569 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 75 × 14 = 1050 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 192 + 797 = 989 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 289 + 932 = 1221 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 357 + 539 = 895 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 338 + 959 = 1297 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 498 + 943 = 1441 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 791 + 968 = 1766 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 479 + 502 = 981 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 93 × 52 = 4836 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 88 × 89 = 7832 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 585 + 940 = 1525 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 637 + 135 = 772 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 119 + 805 = 922 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 28 × 51 = 1428 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 66 × 84 = 5544 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 288 + 476 = 764 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 16 × 16 = 256 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 606 + 512 = 1112 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 12 × 25 = 303 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 41 × 58 = 2378 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 158 + 131 = 289 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 16 × 73 = 1161 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 28 × 62 = 1728 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 64 × 84 = 5376 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 150 + 916 = 1065 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 49 × 21 = 1037 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 260 + 123 = 383 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 730 + 908 = 1638 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 162 + 995 = 1151 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 647 + 149 = 788 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 52 × 37 = 1924 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 963 + 247 = 1216 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 52 × 28 = 1456 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 23 × 70 = 1610 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 16 × 77 = 1232 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 23 × 39 = 904 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 161 + 122 = 283 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 66 × 58 = 3825 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 96 × 24 = 2302 right or wrong? (a) Wrong (b) Right

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