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Maths tricks trick 22: Last-digit detective · Set 365 · 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 75 × 14 = 1048 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 229 + 643 = 877 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 866 + 206 = 1072 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 291 + 455 = 746 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 86 × 22 = 1889 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 21 × 78 = 1638 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 12 × 23 = 276 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 20 × 52 = 1043 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 351 + 480 = 831 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 924 + 553 = 1484 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 78 × 33 = 2573 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 486 + 901 = 1387 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 715 + 752 = 1466 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 972 + 447 = 1425 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 462 + 506 = 960 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 20 × 51 = 1020 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 930 + 814 = 1736 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 818 + 983 = 1793 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 68 × 86 = 5857 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 95 × 28 = 2667 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 97 × 91 = 8827 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 327 + 124 = 443 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 300 + 759 = 1059 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 866 + 359 = 1225 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 17 × 19 = 323 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 18 × 89 = 1606 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 807 + 474 = 1281 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 822 + 984 = 1806 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 284 + 907 = 1184 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 889 + 452 = 1350 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 28 × 20 = 568 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 23 × 48 = 1112 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 504 + 253 = 765 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 279 + 254 = 533 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 163 + 640 = 795 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 361 + 425 = 784 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 46 × 33 = 1523 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 639 + 678 = 1316 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 921 + 137 = 1058 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 25 × 40 = 1000 right or wrong? (a) Wrong (b) Right

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