Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 512 · 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 63 × 26 = 1632 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 68 × 81 = 5508 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 57 × 26 = 1482 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 320 + 390 = 712 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 819 + 484 = 1303 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 62 × 23 = 1426 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 46 × 31 = 1417 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 919 + 849 = 1768 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 234 + 870 = 1104 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 44 × 13 = 572 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 59 × 17 = 1003 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 13 × 37 = 478 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 383 + 650 = 1029 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 268 + 671 = 939 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 31 × 40 = 1240 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 44 × 43 = 1888 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 44 × 38 = 1670 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 32 × 29 = 927 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 32 × 54 = 1723 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 76 × 26 = 1970 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 19 × 69 = 1311 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 26 × 78 = 2030 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 74 × 85 = 6290 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 349 + 997 = 1346 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 17 × 14 = 238 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 305 + 993 = 1299 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 221 + 590 = 810 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 948 + 639 = 1596 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 54 × 53 = 2870 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 366 + 552 = 910 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 953 + 362 = 1315 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 500 + 767 = 1267 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 905 + 361 = 1260 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 523 + 687 = 1210 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 94 × 55 = 5170 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 48 × 40 = 1920 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 651 + 872 = 1515 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 578 + 111 = 689 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 79 × 22 = 1739 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 789 + 999 = 1788 right or wrong? (a) Wrong (b) Right

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