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Maths tricks trick 22: Last-digit detective · Set 467 · 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 885 + 911 = 1796 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 579 + 764 = 1343 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 645 + 299 = 944 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 929 + 274 = 1203 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 332 + 482 = 814 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 46 × 90 = 4140 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 623 + 645 = 1261 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 724 + 457 = 1172 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 23 × 38 = 874 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 48 × 46 = 2208 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 93 × 38 = 3534 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 914 + 540 = 1448 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 43 × 86 = 3701 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 24 × 65 = 1558 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 443 + 383 = 826 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 424 + 360 = 783 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 12 × 52 = 626 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 25 × 24 = 597 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 23 × 34 = 782 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 495 + 394 = 889 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 45 × 62 = 2794 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 200 + 880 = 1083 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 91 × 42 = 3822 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 496 + 692 = 1187 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 19 × 21 = 399 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 58 × 36 = 2088 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 932 + 225 = 1165 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 40 × 19 = 760 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 39 × 71 = 2770 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 56 × 77 = 4309 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 486 + 544 = 1030 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 956 + 437 = 1396 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 925 + 654 = 1577 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 171 + 451 = 626 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 76 × 42 = 3192 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 879 + 863 = 1742 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 484 + 595 = 1072 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 18 × 89 = 1602 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 36 × 39 = 1396 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 367 + 319 = 685 right or wrong? (a) Wrong (b) Right

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