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Maths tricks trick 22: Last-digit detective · Set 226 · 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 849 + 549 = 1405 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 70 × 80 = 5600 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 715 + 662 = 1382 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 740 + 792 = 1532 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 44 × 51 = 2244 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 19 × 20 = 380 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 99 × 38 = 3768 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 52 × 40 = 2080 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 736 + 448 = 1184 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 19 × 45 = 855 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 108 + 706 = 815 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 22 × 19 = 418 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 66 × 96 = 6336 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 98 × 45 = 4410 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 45 × 66 = 2969 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 223 + 942 = 1168 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 370 + 850 = 1220 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 97 × 50 = 4851 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 18 × 85 = 1531 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 855 + 555 = 1401 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 185 + 731 = 924 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 48 × 62 = 2973 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 585 + 880 = 1465 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 719 + 629 = 1348 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 15 × 80 = 1195 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 266 + 396 = 662 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 338 + 753 = 1083 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 645 + 828 = 1473 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 821 + 328 = 1149 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 69 × 89 = 6141 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 472 + 702 = 1174 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 439 + 913 = 1356 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 587 + 453 = 1045 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 28 × 35 = 983 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 66 × 51 = 3359 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 278 + 804 = 1082 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 49 × 21 = 1030 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 65 × 33 = 2141 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 130 + 394 = 520 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 180 + 928 = 1110 right or wrong? (a) Right (b) Wrong

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