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Maths tricks trick 22: Last-digit detective · Set 335 · 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 742 + 338 = 1080 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 64 × 24 = 1536 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 25 × 22 = 550 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 644 + 544 = 1185 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 67 × 88 = 5894 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 325 + 188 = 513 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 864 + 564 = 1429 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 98 × 45 = 4410 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 548 + 502 = 1047 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 252 + 883 = 1135 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 754 + 968 = 1722 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 590 + 598 = 1188 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 351 + 656 = 1007 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 538 + 151 = 689 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 176 + 704 = 878 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 733 + 438 = 1171 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 15 × 43 = 646 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 26 × 42 = 1094 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 36 × 71 = 2556 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 748 + 322 = 1070 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 867 + 168 = 1040 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 34 × 34 = 1164 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 334 + 747 = 1081 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 80 × 51 = 4080 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 92 × 29 = 2668 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 16 × 52 = 832 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 874 + 449 = 1317 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 86 × 84 = 7227 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 745 + 129 = 869 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 771 + 462 = 1233 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 51 × 17 = 867 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 781 + 335 = 1116 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 324 + 201 = 525 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 24 × 54 = 1296 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 51 × 99 = 5049 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 890 + 850 = 1740 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 942 + 625 = 1568 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 25 × 98 = 2442 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 99 × 90 = 8913 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 634 + 188 = 828 right or wrong? (a) Wrong (b) Right

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