Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 661 · 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 37 × 76 = 2811 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 212 + 185 = 395 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 16 × 66 = 1065 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 14 × 53 = 739 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 89 × 61 = 5429 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 609 + 529 = 1138 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 130 + 229 = 362 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 282 + 147 = 429 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 48 × 64 = 3066 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 53 × 59 = 3124 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 151 + 531 = 682 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 500 + 535 = 1034 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 199 + 425 = 620 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 565 + 912 = 1477 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 287 + 776 = 1057 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 17 × 78 = 1326 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 970 + 614 = 1592 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 469 + 255 = 723 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 768 + 280 = 1042 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 37 × 78 = 2881 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 456 + 323 = 779 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 305 + 433 = 732 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 756 + 330 = 1090 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 440 + 480 = 918 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 457 + 735 = 1186 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 897 + 507 = 1404 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 95 × 79 = 7505 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 353 + 246 = 603 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 299 + 868 = 1176 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 34 × 45 = 1532 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 739 + 451 = 1187 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 54 × 97 = 5238 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 15 × 22 = 330 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 292 + 851 = 1137 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 44 × 65 = 2861 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 142 + 106 = 245 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 61 × 79 = 4819 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 165 + 234 = 404 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 22 × 57 = 1254 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 16 × 40 = 640 right or wrong? (a) Wrong (b) Right

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