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Maths tricks trick 22: Last-digit detective · Set 16 · 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 70 × 81 = 5666 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 371 + 504 = 875 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 87 × 92 = 8004 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 36 × 45 = 1620 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 429 + 144 = 573 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 915 + 908 = 1823 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 36 × 67 = 2412 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 61 × 34 = 2074 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 347 + 190 = 537 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 77 × 19 = 1463 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 902 + 472 = 1379 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 376 + 790 = 1167 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 886 + 647 = 1524 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 378 + 483 = 858 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 96 × 40 = 3840 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 48 × 38 = 1816 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 27 × 75 = 2025 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 36 × 34 = 1224 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 672 + 813 = 1485 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 66 × 21 = 1385 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 725 + 656 = 1374 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 303 + 344 = 647 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 62 × 40 = 2480 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 387 + 807 = 1194 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 64 × 47 = 3003 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 35 × 94 = 3281 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 834 + 437 = 1271 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 807 + 219 = 1026 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 295 + 218 = 513 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 728 + 970 = 1701 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 114 + 921 = 1035 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 17 × 34 = 578 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 622 + 973 = 1592 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 994 + 427 = 1412 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 79 × 86 = 6794 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 55 × 13 = 711 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 19 × 65 = 1227 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 705 + 236 = 943 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 73 × 96 = 7008 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 354 + 118 = 464 right or wrong? (a) Right (b) Wrong

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