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Maths tricks trick 22: Last-digit detective · Set 438 · 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 915 + 926 = 1835 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 924 + 804 = 1727 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 969 + 626 = 1603 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 808 + 200 = 1000 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 813 + 564 = 1378 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 220 + 966 = 1180 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 869 + 314 = 1183 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 160 + 548 = 708 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 747 + 326 = 1077 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 69 × 29 = 2008 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 76 × 18 = 1369 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 254 + 624 = 878 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 97 × 54 = 5247 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 145 + 841 = 986 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 192 + 303 = 495 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 65 × 99 = 6435 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 23 × 20 = 452 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 76 × 32 = 2438 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 23 × 60 = 1380 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 17 × 40 = 680 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 756 + 593 = 1346 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 292 + 680 = 978 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 332 + 602 = 928 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 984 + 661 = 1645 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 96 × 33 = 3161 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 296 + 427 = 723 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 112 + 559 = 671 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 305 + 190 = 495 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 19 × 53 = 1003 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 952 + 276 = 1229 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 788 + 224 = 1018 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 474 + 168 = 642 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 78 × 20 = 1560 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 76 × 33 = 2508 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 968 + 934 = 1893 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 668 + 459 = 1126 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 25 × 39 = 975 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 333 + 861 = 1194 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 25 × 78 = 1950 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 40 × 13 = 520 right or wrong? (a) Wrong (b) Right

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