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Maths tricks trick 22: Last-digit detective · Set 267 · 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 75 × 16 = 1193 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 269 + 684 = 953 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 449 + 527 = 968 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 45 × 92 = 4147 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 465 + 918 = 1383 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 56 × 12 = 672 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 851 + 582 = 1433 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 41 × 27 = 1099 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 37 × 28 = 1036 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 558 + 796 = 1354 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 94 × 97 = 9118 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 960 + 159 = 1117 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 20 × 80 = 1592 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 21 × 14 = 289 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 57 × 21 = 1189 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 15 × 55 = 825 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 647 + 915 = 1562 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 42 × 51 = 2142 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 68 × 85 = 5778 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 70 × 17 = 1190 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 49 × 61 = 2989 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 623 + 775 = 1398 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 761 + 328 = 1089 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 673 + 576 = 1249 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 53 × 13 = 689 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 760 + 870 = 1633 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 473 + 634 = 1104 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 496 + 413 = 909 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 124 + 190 = 320 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 46 × 14 = 644 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 355 + 830 = 1185 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 72 × 18 = 1296 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 179 + 245 = 423 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 662 + 292 = 954 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 873 + 686 = 1559 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 300 + 213 = 513 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 767 + 261 = 1028 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 62 × 69 = 4278 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 73 × 64 = 4672 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 493 + 206 = 699 right or wrong? (a) Wrong (b) Right

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