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Maths tricks trick 22: Last-digit detective · Set 105 · 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 833 + 136 = 969 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 640 + 299 = 939 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 267 + 529 = 796 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 64 × 21 = 1344 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 934 + 654 = 1591 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 409 + 184 = 593 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 750 + 811 = 1561 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 55 × 37 = 2034 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 17 × 93 = 1581 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 88 × 67 = 5896 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 53 × 63 = 3339 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 70 × 17 = 1190 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 160 + 602 = 761 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 78 × 86 = 6708 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 38 × 27 = 1026 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 336 + 826 = 1162 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 857 + 276 = 1133 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 45 × 59 = 2655 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 99 × 32 = 3168 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 90 × 42 = 3780 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 898 + 574 = 1463 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 946 + 615 = 1557 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 124 + 411 = 535 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 29 × 65 = 1885 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 934 + 987 = 1921 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 27 × 70 = 1890 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 609 + 112 = 721 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 33 × 45 = 1485 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 709 + 904 = 1615 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 581 + 908 = 1489 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 923 + 558 = 1475 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 30 × 22 = 661 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 62 × 73 = 4526 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 29 × 39 = 1131 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 23 × 98 = 2248 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 270 + 810 = 1085 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 338 + 955 = 1301 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 86 × 28 = 2408 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 870 + 167 = 1045 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 328 + 986 = 1308 right or wrong? (a) Right (b) Wrong

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