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Maths tricks trick 22: Last-digit detective · Set 99 · 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 801 + 595 = 1396 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 84 × 34 = 2856 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 62 × 64 = 3968 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 995 + 685 = 1680 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 40 × 16 = 632 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 802 + 862 = 1660 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 20 × 46 = 920 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 83 × 47 = 3901 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 35 × 86 = 3010 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 541 + 390 = 931 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 16 × 16 = 256 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 62 × 17 = 1049 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 791 + 113 = 904 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 359 + 506 = 864 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 641 + 378 = 1023 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 21 × 51 = 1069 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 785 + 138 = 923 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 15 × 40 = 600 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 641 + 808 = 1449 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 88 × 69 = 6063 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 447 + 859 = 1308 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 64 × 59 = 3776 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 673 + 445 = 1118 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 94 × 27 = 2544 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 96 × 88 = 8441 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 344 + 601 = 952 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 635 + 302 = 934 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 474 + 114 = 579 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 29 × 67 = 1943 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 977 + 471 = 1448 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 17 × 49 = 840 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 988 + 177 = 1165 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 640 + 696 = 1336 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 55 × 65 = 3575 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 91 × 55 = 5005 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 904 + 938 = 1842 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 234 + 350 = 584 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 32 × 77 = 2455 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 51 × 74 = 3782 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 50 × 83 = 4150 right or wrong? (a) Wrong (b) Right

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