Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 150 · 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 46 × 62 = 2849 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 82 × 28 = 2293 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 257 + 773 = 1030 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 14 × 65 = 910 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 39 × 54 = 2106 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 31 × 19 = 585 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 408 + 930 = 1332 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 483 + 149 = 630 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 26 × 39 = 1015 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 233 + 319 = 558 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 979 + 740 = 1718 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 155 + 577 = 732 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 46 × 35 = 1610 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 694 + 463 = 1158 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 45 × 99 = 4461 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 642 + 361 = 999 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 34 × 86 = 2924 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 54 × 65 = 3510 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 65 × 14 = 910 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 76 × 99 = 7524 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 64 × 74 = 4736 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 17 × 80 = 1360 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 427 + 331 = 758 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 71 × 23 = 1633 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 43 × 37 = 1582 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 54 × 18 = 972 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 75 × 37 = 2777 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 537 + 289 = 817 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 984 + 905 = 1889 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 55 × 84 = 4620 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 73 × 18 = 1309 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 20 × 28 = 560 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 823 + 997 = 1818 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 19 × 30 = 570 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 80 × 28 = 2240 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 39 × 33 = 1287 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 191 + 960 = 1151 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 477 + 711 = 1188 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 55 × 24 = 1327 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 281 + 336 = 617 right or wrong? (a) Right (b) Wrong

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