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Maths tricks trick 22: Last-digit detective · Set 102 · 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 67 × 83 = 5570 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 98 × 39 = 3822 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 687 + 758 = 1445 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 791 + 673 = 1460 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 52 × 22 = 1144 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 76 × 90 = 6840 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 107 + 249 = 356 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 898 + 283 = 1183 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 614 + 257 = 879 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 239 + 618 = 857 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 111 + 125 = 236 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 181 + 573 = 756 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 432 + 534 = 966 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 96 × 30 = 2880 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 60 × 90 = 5393 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 738 + 293 = 1039 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 25 × 27 = 668 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 185 + 601 = 786 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 54 × 50 = 2700 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 96 × 12 = 1152 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 75 × 37 = 2775 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 19 × 54 = 1022 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 799 + 413 = 1212 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 36 × 91 = 3280 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 182 + 646 = 826 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 890 + 902 = 1795 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 361 + 888 = 1244 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 695 + 772 = 1467 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 13 × 94 = 1222 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 918 + 140 = 1058 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 980 + 218 = 1198 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 319 + 715 = 1034 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 27 × 83 = 2235 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 738 + 270 = 1008 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 368 + 883 = 1251 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 565 + 537 = 1102 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 292 + 113 = 399 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 794 + 798 = 1587 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 904 + 550 = 1447 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 35 × 40 = 1400 right or wrong? (a) Right (b) Wrong

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