Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 428 · 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 891 + 234 = 1125 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 840 + 978 = 1818 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 859 + 508 = 1367 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 72 × 31 = 2227 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 21 × 45 = 945 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 19 × 23 = 437 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 375 + 853 = 1228 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 222 + 500 = 722 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 43 × 66 = 2839 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 79 × 98 = 7738 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 964 + 999 = 1964 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 573 + 747 = 1320 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 60 × 12 = 720 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 12 × 86 = 1032 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 40 × 98 = 3920 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 574 + 271 = 845 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 318 + 838 = 1158 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 478 + 969 = 1449 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 249 + 112 = 356 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 14 × 14 = 196 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 99 × 71 = 7027 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 267 + 332 = 599 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 32 × 71 = 2272 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 366 + 988 = 1354 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 173 + 181 = 354 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 89 × 35 = 3115 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 70 × 19 = 1333 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 47 × 92 = 4316 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 944 + 775 = 1721 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 99 × 77 = 7623 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 14 × 44 = 611 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 778 + 358 = 1128 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 804 + 659 = 1465 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 322 + 862 = 1184 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 41 × 44 = 1804 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 876 + 121 = 988 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 99 × 22 = 2178 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 51 × 98 = 5005 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 190 + 400 = 585 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 63 × 45 = 2837 right or wrong? (a) Right (b) Wrong

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