Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 240 · 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 266 + 887 = 1153 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 242 + 598 = 840 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 67 × 79 = 5287 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 81 × 23 = 1856 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 696 + 924 = 1621 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 54 × 25 = 1344 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 228 + 658 = 886 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 78 × 54 = 4212 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 88 × 84 = 7392 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 18 × 55 = 990 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 26 × 79 = 2054 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 189 + 249 = 433 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 81 × 81 = 6561 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 99 × 39 = 3861 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 51 × 19 = 969 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 813 + 723 = 1536 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 13 × 36 = 461 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 66 × 71 = 4695 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 63 × 56 = 3537 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 221 + 889 = 1110 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 97 × 78 = 7566 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 30 × 86 = 2580 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 75 × 31 = 2325 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 826 + 299 = 1123 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 962 + 849 = 1811 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 59 × 51 = 3003 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 29 × 17 = 493 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 20 × 65 = 1296 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 508 + 408 = 916 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 92 × 20 = 1848 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 333 + 165 = 495 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 27 × 12 = 324 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 72 × 95 = 6840 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 97 × 20 = 1940 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 180 + 233 = 405 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 340 + 156 = 494 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 38 × 75 = 2848 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 80 × 56 = 4480 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 68 × 96 = 6528 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 122 + 905 = 1027 right or wrong? (a) Wrong (b) Right

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