Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 25 · 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 87 × 91 = 7911 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 383 + 831 = 1207 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 50 × 87 = 4342 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 573 + 145 = 718 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 66 × 35 = 2308 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 738 + 783 = 1513 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 481 + 170 = 651 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 70 × 28 = 1960 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 93 × 62 = 5758 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 83 × 50 = 4150 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 12 × 22 = 264 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 577 + 539 = 1118 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 61 × 90 = 5497 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 406 + 477 = 880 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 876 + 122 = 1001 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 57 × 37 = 2109 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 843 + 517 = 1360 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 99 × 22 = 2178 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 89 × 66 = 5875 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 40 × 21 = 840 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 315 + 616 = 932 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 80 × 26 = 2080 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 94 × 67 = 6298 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 249 + 847 = 1096 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 750 + 802 = 1552 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 909 + 422 = 1325 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 987 + 311 = 1298 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 319 + 943 = 1268 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 638 + 392 = 1030 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 25 × 74 = 1850 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 75 × 63 = 4725 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 494 + 291 = 785 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 77 × 53 = 4081 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 949 + 364 = 1313 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 237 + 179 = 414 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 921 + 120 = 1036 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 908 + 962 = 1875 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 79 × 58 = 4582 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 83 × 99 = 8217 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 47 × 80 = 3767 right or wrong? (a) Wrong (b) Right

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