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Maths tricks trick 22: Last-digit detective · Set 554 · 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 816 + 309 = 1125 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 92 × 93 = 8548 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 43 × 69 = 2964 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 31 × 95 = 2945 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 531 + 821 = 1352 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 332 + 293 = 625 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 778 + 628 = 1405 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 877 + 144 = 1021 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 77 × 54 = 4149 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 93 × 90 = 8367 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 30 × 12 = 356 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 323 + 549 = 872 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 17 × 53 = 901 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 705 + 558 = 1263 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 24 × 87 = 2088 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 87 × 82 = 7134 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 47 × 43 = 2021 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 396 + 273 = 662 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 65 × 16 = 1040 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 27 × 46 = 1242 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 150 + 550 = 700 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 258 + 443 = 701 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 155 + 588 = 743 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 383 + 905 = 1290 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 504 + 126 = 638 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 545 + 547 = 1092 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 29 × 93 = 2697 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 74 × 49 = 3626 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 27 × 35 = 945 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 668 + 786 = 1454 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 51 × 17 = 869 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 48 × 12 = 576 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 65 × 38 = 2470 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 799 + 337 = 1145 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 745 + 741 = 1491 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 39 × 75 = 2925 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 37 × 86 = 3181 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 29 × 56 = 1624 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 322 + 372 = 692 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 70 × 50 = 3500 right or wrong? (a) Wrong (b) Right

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