Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 906 · 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 531 + 782 = 1310 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 783 + 711 = 1494 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 336 + 471 = 807 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 17 × 92 = 1564 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 707 + 979 = 1686 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 294 + 874 = 1168 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 23 × 57 = 1311 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 551 + 129 = 680 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 288 + 188 = 483 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 30 × 60 = 1808 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 917 + 277 = 1202 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 65 × 24 = 1560 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 62 × 20 = 1240 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 35 × 65 = 2275 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 91 × 91 = 8281 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 291 + 637 = 928 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 20 × 27 = 540 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 729 + 988 = 1717 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 194 + 251 = 437 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 48 × 70 = 3367 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 349 + 622 = 979 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 25 × 12 = 303 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 84 × 69 = 5796 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 582 + 676 = 1256 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 23 × 56 = 1288 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 879 + 758 = 1637 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 616 + 353 = 971 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 86 × 15 = 1294 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 688 + 257 = 945 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 69 × 46 = 3182 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 54 × 65 = 3504 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 780 + 417 = 1189 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 53 × 49 = 2594 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 50 × 92 = 4600 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 59 × 24 = 1416 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 774 + 327 = 1092 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 33 × 34 = 1122 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 37 × 73 = 2701 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 72 × 22 = 1589 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 82 × 34 = 2794 right or wrong? (a) Right (b) Wrong

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