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Maths tricks trick 22: Last-digit detective · Set 737 · 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 703 + 896 = 1599 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 38 × 67 = 2539 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 709 + 672 = 1375 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 762 + 482 = 1244 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 839 + 240 = 1079 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 51 × 50 = 2550 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 76 × 90 = 6840 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 39 × 66 = 2568 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 546 + 976 = 1522 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 988 + 306 = 1301 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 22 × 53 = 1166 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 208 + 776 = 984 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 30 × 60 = 1802 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 17 × 26 = 448 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 346 + 207 = 558 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 54 × 91 = 4913 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 93 × 72 = 6697 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 434 + 592 = 1031 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 21 × 81 = 1697 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 541 + 364 = 903 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 288 + 380 = 668 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 284 + 881 = 1156 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 31 × 72 = 2232 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 25 × 54 = 1350 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 257 + 729 = 986 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 76 × 35 = 2661 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 29 × 47 = 1363 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 75 × 52 = 3898 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 326 + 564 = 893 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 950 + 279 = 1233 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 649 + 437 = 1077 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 88 × 13 = 1144 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 318 + 401 = 719 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 296 + 547 = 843 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 338 + 698 = 1036 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 89 × 22 = 1958 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 29 × 57 = 1653 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 56 × 53 = 2968 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 114 + 234 = 348 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 45 × 41 = 1845 right or wrong? (a) Right (b) Wrong

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