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Maths tricks trick 22: Last-digit detective · Set 447 · 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 726 + 317 = 1041 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 53 × 71 = 3762 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 59 × 96 = 5664 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 43 × 41 = 1763 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 678 + 850 = 1528 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 816 + 454 = 1268 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 33 × 41 = 1353 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 34 × 29 = 986 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 98 × 13 = 1283 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 239 + 207 = 446 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 940 + 666 = 1614 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 860 + 288 = 1148 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 35 × 95 = 3325 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 32 × 86 = 2752 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 16 × 63 = 1008 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 20 × 57 = 1140 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 55 × 63 = 3472 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 108 + 964 = 1072 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 781 + 705 = 1483 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 270 + 336 = 606 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 98 × 56 = 5488 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 612 + 638 = 1250 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 737 + 679 = 1416 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 36 × 47 = 1686 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 43 × 91 = 3910 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 515 + 486 = 1010 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 912 + 138 = 1050 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 60 × 17 = 1020 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 133 + 227 = 360 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 69 × 65 = 4476 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 869 + 179 = 1048 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 542 + 498 = 1032 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 598 + 946 = 1544 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 72 × 77 = 5544 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 420 + 147 = 567 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 45 × 42 = 1890 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 40 × 14 = 565 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 30 × 56 = 1680 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 61 × 48 = 2928 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 85 × 96 = 8160 right or wrong? (a) Wrong (b) Right

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