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Maths tricks trick 22: Last-digit detective · Set 482 · 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 22 × 70 = 1539 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 87 × 55 = 4785 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 681 + 585 = 1266 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 931 + 900 = 1831 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 225 + 734 = 959 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 83 × 33 = 2736 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 448 + 566 = 1020 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 29 × 76 = 2204 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 862 + 206 = 1059 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 45 × 17 = 765 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 662 + 161 = 815 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 19 × 99 = 1885 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 157 + 688 = 845 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 335 + 765 = 1100 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 630 + 292 = 917 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 83 × 84 = 6972 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 737 + 299 = 1036 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 95 × 30 = 2849 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 335 + 926 = 1257 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 21 × 30 = 628 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 496 + 926 = 1422 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 31 × 39 = 1209 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 86 × 38 = 3268 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 71 × 80 = 5689 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 125 + 151 = 276 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 358 + 986 = 1347 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 732 + 124 = 856 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 92 × 55 = 5060 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 58 × 12 = 700 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 236 + 222 = 467 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 88 × 81 = 7128 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 87 × 54 = 4690 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 26 × 32 = 826 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 90 × 49 = 4410 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 75 × 18 = 1353 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 565 + 383 = 948 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 356 + 999 = 1355 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 891 + 251 = 1151 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 855 + 296 = 1151 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 14 × 46 = 650 right or wrong? (a) Wrong (b) Right

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