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Maths tricks trick 22: Last-digit detective · Set 911 · 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 956 + 495 = 1451 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 73 × 34 = 2490 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 400 + 369 = 769 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 473 + 220 = 698 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 90 × 35 = 3150 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 12 × 51 = 620 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 287 + 194 = 484 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 276 + 574 = 854 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 858 + 393 = 1255 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 326 + 440 = 766 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 488 + 759 = 1247 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 954 + 287 = 1240 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 873 + 112 = 985 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 344 + 399 = 743 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 258 + 593 = 851 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 83 × 32 = 2652 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 212 + 642 = 852 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 343 + 397 = 740 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 771 + 596 = 1367 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 26 × 32 = 832 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 973 + 298 = 1271 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 47 × 40 = 1883 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 445 + 774 = 1219 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 59 × 44 = 2600 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 552 + 786 = 1344 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 687 + 112 = 799 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 31 × 33 = 1022 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 994 + 272 = 1262 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 45 × 51 = 2296 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 38 × 27 = 1026 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 489 + 768 = 1257 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 83 × 80 = 6633 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 319 + 519 = 836 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 52 × 52 = 2704 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 929 + 638 = 1567 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 69 × 65 = 4477 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 88 × 37 = 3256 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 984 + 115 = 1099 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 849 + 436 = 1293 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 181 + 980 = 1160 right or wrong? (a) Wrong (b) Right

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