Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 968 · 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 35 × 49 = 1710 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 425 + 211 = 636 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 53 × 17 = 906 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 58 × 23 = 1334 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 82 × 70 = 5740 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 304 + 181 = 485 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 33 × 17 = 561 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 66 × 68 = 4485 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 966 + 774 = 1732 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 350 + 746 = 1096 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 545 + 651 = 1196 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 794 + 313 = 1101 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 308 + 217 = 525 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 18 × 49 = 882 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 18 × 23 = 414 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 62 × 22 = 1364 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 89 × 29 = 2585 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 84 × 99 = 8310 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 95 × 69 = 6551 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 48 × 58 = 2784 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 992 + 283 = 1275 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 35 × 47 = 1648 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 862 + 828 = 1684 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 953 + 821 = 1776 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 669 + 108 = 771 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 967 + 239 = 1200 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 69 × 93 = 6417 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 797 + 735 = 1539 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 34 × 86 = 2932 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 494 + 693 = 1187 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 118 + 535 = 653 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 729 + 116 = 848 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 64 × 17 = 1082 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 966 + 423 = 1384 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 758 + 489 = 1247 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 527 + 512 = 1039 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 71 × 57 = 4047 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 924 + 284 = 1208 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 883 + 318 = 1201 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 66 × 42 = 2779 right or wrong? (a) Right (b) Wrong

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