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Maths tricks trick 22: Last-digit detective · Set 494 · 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 41 × 52 = 2125 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 879 + 723 = 1602 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 29 × 15 = 435 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 479 + 241 = 711 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 67 × 18 = 1214 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 275 + 459 = 734 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 966 + 256 = 1220 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 229 + 603 = 832 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 825 + 813 = 1644 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 335 + 284 = 619 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 288 + 500 = 787 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 468 + 742 = 1205 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 78 × 20 = 1560 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 876 + 649 = 1516 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 391 + 627 = 1017 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 19 × 21 = 399 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 96 × 94 = 9024 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 75 × 39 = 2916 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 35 × 12 = 418 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 86 × 43 = 3698 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 30 × 33 = 990 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 407 + 910 = 1319 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 91 × 26 = 2367 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 14 × 23 = 322 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 709 + 492 = 1209 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 18 × 27 = 478 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 290 + 595 = 886 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 61 × 38 = 2325 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 26 × 12 = 311 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 27 × 38 = 1031 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 535 + 886 = 1421 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 24 × 90 = 2160 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 12 × 65 = 780 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 28 × 58 = 1624 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 54 × 31 = 1674 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 54 × 46 = 2479 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 435 + 549 = 975 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 727 + 680 = 1407 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 441 + 993 = 1442 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 67 × 54 = 3627 right or wrong? (a) Wrong (b) Right

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