Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 837 · 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 855 + 637 = 1489 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 507 + 470 = 986 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 999 + 154 = 1153 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 789 + 769 = 1558 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 879 + 448 = 1327 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 96 × 42 = 4032 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 253 + 296 = 558 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 799 + 133 = 934 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 846 + 270 = 1116 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 326 + 849 = 1175 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 22 × 67 = 1474 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 770 + 963 = 1724 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 560 + 223 = 786 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 94 × 19 = 1786 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 72 × 38 = 2731 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 165 + 477 = 633 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 37 × 72 = 2656 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 187 + 188 = 372 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 417 + 400 = 820 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 747 + 343 = 1093 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 874 + 774 = 1641 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 42 × 84 = 3532 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 29 × 16 = 464 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 169 + 598 = 763 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 49 × 18 = 880 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 273 + 155 = 434 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 217 + 364 = 578 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 18 × 89 = 1596 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 67 × 73 = 4890 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 374 + 847 = 1226 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 699 + 770 = 1469 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 28 × 84 = 2352 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 159 + 370 = 537 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 28 × 24 = 674 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 34 × 92 = 3128 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 40 × 27 = 1080 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 298 + 815 = 1113 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 98 × 34 = 3340 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 989 + 284 = 1274 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 892 + 195 = 1083 right or wrong? (a) Wrong (b) Right

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