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Maths tricks trick 22: Last-digit detective · Set 472 · 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 98 × 95 = 9310 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 487 + 162 = 658 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 358 + 967 = 1325 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 533 + 938 = 1471 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 608 + 538 = 1137 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 28 × 80 = 2242 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 173 + 747 = 920 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 455 + 531 = 990 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 18 × 83 = 1494 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 113 + 264 = 377 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 43 × 27 = 1161 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 78 × 52 = 4047 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 141 + 758 = 899 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 15 × 50 = 754 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 277 + 133 = 408 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 31 × 73 = 2263 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 38 × 75 = 2850 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 975 + 886 = 1861 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 49 × 87 = 4260 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 19 × 74 = 1405 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 98 × 23 = 2245 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 49 × 49 = 2401 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 51 × 82 = 4175 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 33 × 82 = 2710 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 855 + 208 = 1060 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 13 × 18 = 241 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 394 + 710 = 1101 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 19 × 32 = 606 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 951 + 361 = 1303 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 975 + 531 = 1506 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 256 + 513 = 769 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 778 + 268 = 1046 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 30 × 16 = 476 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 220 + 217 = 428 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 15 × 32 = 485 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 785 + 265 = 1050 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 966 + 401 = 1367 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 27 × 28 = 756 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 46 × 35 = 1610 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 208 + 186 = 399 right or wrong? (a) Wrong (b) Right

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