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Maths tricks trick 22: Last-digit detective · Set 498 · 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 594 + 121 = 714 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 88 × 20 = 1758 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 33 × 59 = 1943 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 653 + 637 = 1290 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 51 × 38 = 1938 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 748 + 332 = 1076 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 778 + 578 = 1352 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 869 + 998 = 1867 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 51 × 64 = 3264 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 969 + 462 = 1431 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 300 + 434 = 734 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 811 + 296 = 1107 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 18 × 96 = 1734 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 70 × 95 = 6641 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 720 + 268 = 988 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 69 × 18 = 1239 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 28 × 18 = 498 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 645 + 783 = 1432 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 733 + 302 = 1031 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 629 + 612 = 1241 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 97 × 81 = 7861 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 797 + 854 = 1642 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 195 + 579 = 767 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 51 × 33 = 1683 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 656 + 561 = 1217 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 633 + 943 = 1576 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 86 × 36 = 3090 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 511 + 366 = 877 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 944 + 721 = 1665 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 44 × 28 = 1232 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 802 + 859 = 1668 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 506 + 775 = 1281 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 601 + 700 = 1310 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 56 × 48 = 2688 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 62 × 91 = 5642 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 971 + 670 = 1641 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 305 + 356 = 666 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 219 + 648 = 867 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 172 + 945 = 1117 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 206 + 950 = 1165 right or wrong? (a) Wrong (b) Right

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