Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 100 · 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 49 × 80 = 3920 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 531 + 359 = 890 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 14 × 14 = 202 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 72 × 23 = 1656 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 115 + 536 = 651 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 134 + 332 = 466 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 557 + 586 = 1150 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 55 × 12 = 660 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 27 × 87 = 2349 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 15 × 56 = 831 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 68 × 49 = 3325 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 66 × 68 = 4497 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 89 × 14 = 1246 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 894 + 415 = 1301 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 64 × 47 = 3008 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 199 + 894 = 1086 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 945 + 120 = 1065 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 98 × 14 = 1372 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 77 × 85 = 6545 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 21 × 27 = 567 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 539 + 195 = 734 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 25 × 86 = 2157 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 29 × 63 = 1827 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 17 × 65 = 1105 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 236 + 115 = 357 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 998 + 804 = 1802 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 76 × 60 = 4560 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 958 + 237 = 1195 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 355 + 217 = 578 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 30 × 27 = 805 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 160 + 303 = 462 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 66 × 66 = 4349 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 27 × 26 = 700 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 728 + 349 = 1085 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 88 × 20 = 1752 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 34 × 68 = 2309 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 408 + 944 = 1352 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 14 × 24 = 341 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 37 × 34 = 1258 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 609 + 165 = 774 right or wrong? (a) Right (b) Wrong

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