Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 527 · 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 36 × 66 = 2376 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 184 + 876 = 1060 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 194 + 393 = 589 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 458 + 251 = 710 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 667 + 860 = 1534 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 49 × 45 = 2212 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 31 × 26 = 809 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 861 + 188 = 1049 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 76 × 15 = 1140 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 41 × 79 = 3242 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 294 + 112 = 406 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 485 + 309 = 795 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 71 × 78 = 5538 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 269 + 352 = 621 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 23 × 24 = 552 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 66 × 55 = 3627 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 17 × 27 = 456 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 17 × 28 = 478 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 969 + 246 = 1215 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 884 + 228 = 1112 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 39 × 84 = 3281 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 293 + 374 = 667 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 26 × 88 = 2288 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 95 × 33 = 3135 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 96 × 50 = 4800 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 91 × 51 = 4641 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 195 + 129 = 324 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 29 × 79 = 2284 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 36 × 32 = 1143 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 86 × 19 = 1634 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 825 + 379 = 1204 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 70 × 50 = 3500 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 91 × 40 = 3636 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 383 + 250 = 628 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 329 + 386 = 716 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 89 × 17 = 1513 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 19 × 35 = 665 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 14 × 44 = 616 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 228 + 550 = 776 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 32 × 32 = 1024 right or wrong? (a) Right (b) Wrong

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