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Maths tricks trick 22: Last-digit detective · Set 528 · 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 326 + 350 = 676 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 786 + 822 = 1617 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 661 + 894 = 1547 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 92 × 18 = 1656 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 32 × 72 = 2298 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 565 + 342 = 906 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 662 + 267 = 928 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 263 + 771 = 1039 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 78 × 20 = 1557 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 304 + 875 = 1179 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 168 + 814 = 982 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 25 × 73 = 1825 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 519 + 855 = 1374 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 827 + 996 = 1816 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 93 × 65 = 6048 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 74 × 99 = 7326 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 54 × 33 = 1790 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 62 × 25 = 1550 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 746 + 884 = 1630 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 42 × 96 = 4032 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 275 + 635 = 910 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 87 × 42 = 3647 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 770 + 625 = 1397 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 22 × 16 = 347 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 709 + 985 = 1703 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 94 × 50 = 4700 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 29 × 43 = 1251 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 68 × 88 = 5976 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 38 × 66 = 2508 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 31 × 83 = 2573 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 73 × 29 = 2117 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 46 × 33 = 1518 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 562 + 554 = 1116 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 14 × 15 = 205 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 481 + 878 = 1354 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 79 × 18 = 1417 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 93 × 78 = 7254 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 986 + 486 = 1466 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 98 × 17 = 1666 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 509 + 232 = 741 right or wrong? (a) Wrong (b) Right

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