Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 928 · 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 513 + 384 = 892 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 582 + 703 = 1279 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 65 × 21 = 1364 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 86 × 13 = 1124 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 987 + 192 = 1180 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 258 + 174 = 432 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 47 × 78 = 3666 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 95 × 64 = 6080 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 93 × 13 = 1209 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 31 × 91 = 2813 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 728 + 542 = 1270 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 348 + 670 = 1018 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 72 × 31 = 2232 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 500 + 637 = 1146 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 13 × 24 = 312 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 244 + 548 = 792 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 232 + 145 = 379 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 16 × 75 = 1200 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 191 + 269 = 457 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 69 × 15 = 1035 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 93 × 72 = 6701 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 774 + 612 = 1382 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 587 + 706 = 1293 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 274 + 897 = 1171 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 287 + 155 = 442 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 518 + 201 = 719 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 20 × 30 = 591 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 77 × 23 = 1771 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 22 × 52 = 1141 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 59 × 50 = 2949 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 431 + 158 = 590 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 637 + 349 = 986 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 802 + 653 = 1452 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 386 + 126 = 512 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 93 × 28 = 2604 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 68 × 26 = 1768 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 762 + 984 = 1747 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 23 × 80 = 1844 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 54 × 96 = 5184 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 998 + 383 = 1387 right or wrong? (a) Wrong (b) Right

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