Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 850 · 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 522 + 302 = 829 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 54 × 82 = 4428 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 12 × 60 = 720 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 477 + 605 = 1082 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 72 × 21 = 1512 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 71 × 47 = 3336 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 50 × 26 = 1300 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 143 + 316 = 468 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 50 × 29 = 1450 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 886 + 627 = 1515 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 403 + 606 = 1000 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 247 + 549 = 796 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 30 × 13 = 390 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 587 + 771 = 1354 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 92 × 92 = 8464 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 769 + 818 = 1588 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 75 × 33 = 2468 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 366 + 275 = 641 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 614 + 362 = 976 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 18 × 52 = 936 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 95 × 52 = 4948 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 84 × 24 = 2015 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 22 × 99 = 2178 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 630 + 286 = 916 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 273 + 973 = 1244 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 50 × 69 = 3450 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 72 × 68 = 4896 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 14 × 40 = 560 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 244 + 661 = 905 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 58 × 98 = 5684 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 585 + 668 = 1261 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 748 + 578 = 1326 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 166 + 840 = 998 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 20 × 54 = 1080 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 242 + 296 = 538 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 68 × 47 = 3196 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 14 × 64 = 896 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 470 + 640 = 1110 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 14 × 90 = 1252 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 666 + 375 = 1041 right or wrong? (a) Wrong (b) Right

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