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Maths tricks trick 22: Last-digit detective · Set 733 · 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 81 × 24 = 1944 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 349 + 461 = 806 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 44 × 22 = 962 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 157 + 845 = 1002 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 492 + 399 = 891 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 66 × 15 = 989 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 940 + 494 = 1434 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 553 + 256 = 809 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 83 × 94 = 7811 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 39 × 14 = 544 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 612 + 482 = 1094 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 931 + 607 = 1538 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 43 × 12 = 518 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 654 + 622 = 1276 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 334 + 395 = 729 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 40 × 12 = 488 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 531 + 681 = 1212 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 751 + 849 = 1608 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 95 × 15 = 1425 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 290 + 853 = 1143 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 13 × 45 = 587 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 431 + 705 = 1128 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 156 + 993 = 1149 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 85 × 76 = 6460 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 92 × 26 = 2398 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 295 + 504 = 799 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 299 + 816 = 1115 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 926 + 964 = 1886 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 95 × 45 = 4275 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 759 + 256 = 1015 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 80 × 93 = 7445 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 23 × 84 = 1932 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 54 × 58 = 3132 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 50 × 55 = 2750 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 36 × 15 = 539 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 51 × 17 = 867 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 33 × 86 = 2836 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 118 + 194 = 317 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 278 + 676 = 955 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 34 × 74 = 2507 right or wrong? (a) Right (b) Wrong

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