Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 206 · 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 96 × 29 = 2784 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 46 × 31 = 1428 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 49 × 23 = 1125 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 434 + 240 = 674 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 74 × 35 = 2590 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 372 + 704 = 1079 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 12 × 52 = 622 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 12 × 67 = 804 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 82 × 15 = 1230 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 214 + 465 = 679 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 176 + 180 = 356 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 664 + 504 = 1159 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 64 × 53 = 3386 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 20 × 75 = 1495 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 84 × 40 = 3365 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 529 + 271 = 791 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 15 × 43 = 640 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 982 + 285 = 1267 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 78 × 51 = 3978 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 279 + 959 = 1240 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 355 + 935 = 1291 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 88 × 92 = 8093 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 913 + 648 = 1561 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 561 + 263 = 820 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 24 × 78 = 1865 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 96 × 99 = 9504 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 32 × 36 = 1152 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 71 × 35 = 2494 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 97 × 19 = 1835 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 824 + 240 = 1064 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 61 × 86 = 5246 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 611 + 178 = 792 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 380 + 454 = 834 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 22 × 33 = 726 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 31 × 26 = 811 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 289 + 329 = 618 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 68 × 54 = 3672 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 484 + 946 = 1439 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 697 + 110 = 807 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 674 + 128 = 810 right or wrong? (a) Right (b) Wrong

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