Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 308 · 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 41 × 28 = 1153 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 264 + 265 = 529 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 28 × 37 = 1036 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 29 × 39 = 1124 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 836 + 969 = 1801 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 948 + 466 = 1414 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 280 + 349 = 637 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 87 × 18 = 1566 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 872 + 367 = 1239 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 716 + 840 = 1561 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 87 × 12 = 1044 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 436 + 382 = 809 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 66 × 64 = 4221 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 396 + 971 = 1367 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 364 + 276 = 640 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 907 + 332 = 1248 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 21 × 66 = 1386 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 96 × 15 = 1440 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 462 + 186 = 645 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 20 × 94 = 1889 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 79 × 23 = 1817 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 60 × 52 = 3120 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 56 × 77 = 4312 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 78 × 13 = 1012 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 670 + 255 = 925 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 916 + 459 = 1368 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 99 × 60 = 5940 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 15 × 32 = 477 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 932 + 677 = 1609 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 379 + 782 = 1158 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 15 × 23 = 345 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 573 + 624 = 1197 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 351 + 573 = 926 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 99 × 91 = 9011 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 74 × 79 = 5848 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 13 × 92 = 1200 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 33 × 85 = 2799 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 351 + 281 = 631 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 209 + 337 = 546 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 446 + 459 = 905 right or wrong? (a) Wrong (b) Right

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