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Maths tricks trick 22: Last-digit detective · Set 607 · 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 36 × 84 = 3028 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 28 × 55 = 1540 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 992 + 395 = 1387 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 41 × 78 = 3199 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 46 × 98 = 4504 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 45 × 85 = 3825 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 88 × 48 = 4224 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 66 × 43 = 2838 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 99 × 73 = 7236 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 461 + 924 = 1385 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 503 + 306 = 810 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 54 × 67 = 3618 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 782 + 823 = 1598 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 22 × 48 = 1056 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 374 + 312 = 678 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 371 + 847 = 1209 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 341 + 935 = 1276 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 70 × 18 = 1261 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 183 + 799 = 989 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 53 × 89 = 4711 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 356 + 177 = 530 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 448 + 865 = 1313 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 159 + 142 = 299 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 51 × 75 = 3831 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 147 + 711 = 855 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 637 + 474 = 1111 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 449 + 608 = 1061 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 61 × 76 = 4631 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 844 + 757 = 1601 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 604 + 455 = 1059 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 847 + 612 = 1461 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 664 + 189 = 862 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 18 × 69 = 1242 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 47 × 51 = 2396 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 53 × 45 = 2387 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 88 × 65 = 5716 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 374 + 182 = 553 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 639 + 201 = 840 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 19 × 83 = 1572 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 17 × 80 = 1360 right or wrong? (a) Right (b) Wrong

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