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Maths tricks trick 22: Last-digit detective · Set 440 · 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 95 × 19 = 1805 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 878 + 576 = 1454 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 483 + 856 = 1339 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 33 × 96 = 3168 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 68 × 77 = 5236 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 684 + 260 = 944 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 545 + 110 = 661 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 29 × 12 = 345 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 938 + 445 = 1388 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 472 + 263 = 737 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 967 + 565 = 1532 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 715 + 814 = 1529 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 32 × 97 = 3104 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 853 + 519 = 1372 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 604 + 364 = 973 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 94 × 31 = 2914 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 264 + 571 = 835 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 266 + 146 = 420 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 503 + 791 = 1294 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 45 × 16 = 717 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 38 × 75 = 2850 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 607 + 691 = 1294 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 30 × 35 = 1059 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 24 × 55 = 1322 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 397 + 662 = 1059 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 42 × 68 = 2851 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 181 + 382 = 567 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 679 + 216 = 898 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 99 × 29 = 2865 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 712 + 686 = 1401 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 59 × 98 = 5782 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 88 × 82 = 7216 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 347 + 255 = 597 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 87 × 32 = 2777 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 604 + 572 = 1174 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 31 × 23 = 713 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 90 × 55 = 4950 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 60 × 27 = 1620 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 909 + 892 = 1808 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 676 + 314 = 990 right or wrong? (a) Right (b) Wrong

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