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Maths tricks trick 22: Last-digit detective · Set 569 · 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 638 + 743 = 1390 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 37 × 60 = 2223 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 27 × 46 = 1243 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 143 + 820 = 959 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 54 × 49 = 2646 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 163 + 654 = 808 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 822 + 581 = 1403 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 97 × 56 = 5427 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 482 + 195 = 676 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 76 × 72 = 5477 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 19 × 27 = 513 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 15 × 68 = 1020 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 70 × 64 = 4477 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 359 + 181 = 540 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 64 × 60 = 3840 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 906 + 528 = 1434 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 19 × 78 = 1482 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 543 + 292 = 844 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 38 × 49 = 1853 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 774 + 134 = 908 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 75 × 79 = 5925 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 744 + 263 = 998 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 921 + 842 = 1757 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 49 × 48 = 2353 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 841 + 606 = 1447 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 89 × 45 = 4012 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 27 × 97 = 2611 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 278 + 582 = 860 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 47 × 44 = 2065 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 218 + 557 = 776 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 36 × 69 = 2484 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 860 + 697 = 1564 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 79 × 86 = 6794 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 848 + 364 = 1206 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 39 × 73 = 2838 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 14 × 66 = 924 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 734 + 703 = 1437 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 72 × 40 = 2880 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 71 × 25 = 1774 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 909 + 517 = 1426 right or wrong? (a) Wrong (b) Right

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