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Maths tricks trick 22: Last-digit detective · Set 270 · 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 984 + 705 = 1689 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 73 × 42 = 3065 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 848 + 638 = 1486 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 901 + 822 = 1715 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 71 × 28 = 1991 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 552 + 954 = 1506 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 362 + 226 = 585 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 30 × 60 = 1800 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 946 + 253 = 1199 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 24 × 26 = 624 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 614 + 770 = 1384 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 55 × 43 = 2365 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 89 × 35 = 3106 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 78 × 99 = 7714 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 141 + 431 = 571 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 530 + 272 = 802 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 29 × 17 = 493 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 909 + 199 = 1111 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 532 + 265 = 797 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 660 + 481 = 1141 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 89 × 83 = 7387 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 89 × 20 = 1779 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 35 × 28 = 979 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 31 × 34 = 1052 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 840 + 781 = 1621 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 29 × 35 = 1015 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 54 × 43 = 2322 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 722 + 692 = 1407 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 833 + 934 = 1767 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 228 + 169 = 399 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 870 + 289 = 1159 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 71 × 80 = 5680 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 184 + 633 = 821 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 25 × 54 = 1346 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 51 × 30 = 1534 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 105 + 604 = 710 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 793 + 782 = 1575 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 193 + 860 = 1053 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 757 + 227 = 984 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 589 + 504 = 1093 right or wrong? (a) Wrong (b) Right

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