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Maths tricks trick 22: Last-digit detective · Set 544 · 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 453 + 751 = 1206 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 91 × 52 = 4732 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 45 × 96 = 4320 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 43 × 26 = 1118 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 34 × 14 = 476 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 803 + 882 = 1683 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 68 × 33 = 2238 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 65 × 34 = 2210 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 277 + 377 = 654 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 71 × 61 = 4325 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 71 × 98 = 6958 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 233 + 945 = 1178 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 12 × 93 = 1116 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 284 + 734 = 1024 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 12 × 47 = 559 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 84 × 77 = 6468 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 26 × 49 = 1274 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 973 + 224 = 1197 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 14 × 73 = 1028 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 17 × 17 = 289 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 47 × 63 = 2961 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 69 × 82 = 5657 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 282 + 229 = 511 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 357 + 466 = 814 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 66 × 56 = 3697 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 937 + 635 = 1572 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 35 × 79 = 2768 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 69 × 92 = 6348 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 851 + 774 = 1617 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 33 × 21 = 693 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 177 + 231 = 404 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 683 + 144 = 830 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 63 × 75 = 4725 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 494 + 146 = 647 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 526 + 442 = 968 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 35 × 15 = 524 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 30 × 43 = 1290 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 485 + 628 = 1120 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 905 + 818 = 1723 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 206 + 696 = 903 right or wrong? (a) Right (b) Wrong

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