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Maths tricks trick 22: Last-digit detective · Set 246 · 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 818 + 262 = 1088 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 231 + 801 = 1032 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 763 + 524 = 1287 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 73 × 60 = 4377 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 872 + 345 = 1217 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 554 + 914 = 1468 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 116 + 237 = 353 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 317 + 754 = 1071 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 87 × 37 = 3219 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 195 + 256 = 457 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 30 × 33 = 992 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 154 + 357 = 510 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 568 + 448 = 1025 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 43 × 71 = 3053 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 94 × 51 = 4799 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 860 + 431 = 1291 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 69 × 93 = 6417 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 661 + 542 = 1208 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 543 + 356 = 902 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 712 + 227 = 939 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 634 + 519 = 1153 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 81 × 72 = 5841 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 32 × 36 = 1147 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 114 + 773 = 879 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 87 × 58 = 5046 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 91 × 59 = 5365 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 80 × 88 = 7040 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 596 + 795 = 1391 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 214 + 429 = 650 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 733 + 809 = 1541 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 86 × 75 = 6441 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 49 × 73 = 3577 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 19 × 97 = 1847 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 677 + 463 = 1135 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 223 + 941 = 1164 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 84 × 16 = 1349 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 313 + 595 = 909 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 69 × 96 = 6620 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 667 + 660 = 1327 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 83 × 32 = 2650 right or wrong? (a) Wrong (b) Right

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