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Maths tricks trick 22: Last-digit detective · Set 437 · 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 252 + 390 = 642 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 41 × 75 = 3077 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 606 + 816 = 1422 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 78 × 68 = 5309 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 326 + 297 = 615 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 133 + 903 = 1039 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 601 + 703 = 1304 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 195 + 642 = 837 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 745 + 755 = 1500 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 613 + 709 = 1326 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 957 + 624 = 1579 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 70 × 37 = 2586 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 45 × 58 = 2610 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 78 × 98 = 7651 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 923 + 714 = 1644 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 17 × 17 = 289 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 62 × 25 = 1545 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 13 × 82 = 1069 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 435 + 270 = 711 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 89 × 48 = 4280 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 107 + 876 = 980 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 736 + 975 = 1711 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 42 × 42 = 1764 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 530 + 108 = 638 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 97 × 68 = 6590 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 76 × 58 = 4415 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 874 + 302 = 1176 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 248 + 818 = 1063 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 641 + 408 = 1043 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 44 × 29 = 1276 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 481 + 149 = 634 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 73 × 21 = 1533 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 33 × 62 = 2046 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 813 + 889 = 1711 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 25 × 37 = 932 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 421 + 835 = 1256 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 27 × 86 = 2320 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 336 + 784 = 1120 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 529 + 464 = 984 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 859 + 539 = 1398 right or wrong? (a) Wrong (b) Right

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