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Maths tricks trick 22: Last-digit detective · Set 473 · 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 12 × 53 = 636 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 561 + 409 = 970 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 389 + 344 = 733 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 989 + 374 = 1362 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 301 + 619 = 920 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 594 + 839 = 1433 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 697 + 227 = 924 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 84 × 40 = 3360 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 96 × 31 = 2976 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 74 × 32 = 2368 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 96 × 87 = 8352 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 15 × 13 = 195 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 472 + 201 = 673 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 15 × 15 = 221 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 72 × 62 = 4472 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 378 + 726 = 1113 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 937 + 803 = 1740 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 86 × 90 = 7741 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 46 × 12 = 552 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 368 + 408 = 784 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 121 + 667 = 788 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 39 × 90 = 3510 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 45 × 93 = 4183 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 92 × 68 = 6253 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 18 × 15 = 270 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 873 + 363 = 1240 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 96 × 93 = 8921 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 409 + 943 = 1356 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 23 × 70 = 1610 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 340 + 307 = 638 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 96 × 22 = 2112 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 833 + 867 = 1700 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 417 + 942 = 1359 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 174 + 903 = 1077 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 29 × 35 = 1015 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 557 + 963 = 1513 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 959 + 533 = 1492 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 771 + 648 = 1417 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 666 + 505 = 1171 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 673 + 564 = 1237 right or wrong? (a) Right (b) Wrong

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