Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 735 · 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 173 + 524 = 697 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 66 × 98 = 6468 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 849 + 116 = 965 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 98 × 46 = 4508 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 45 × 81 = 3639 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 472 + 597 = 1069 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 23 × 19 = 428 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 162 + 883 = 1050 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 379 + 506 = 885 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 84 × 20 = 1680 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 145 + 837 = 982 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 22 × 58 = 1276 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 78 × 25 = 1950 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 660 + 950 = 1608 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 222 + 143 = 371 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 695 + 323 = 1018 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 65 × 71 = 4615 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 96 × 37 = 3552 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 368 + 656 = 1024 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 45 × 94 = 4230 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 960 + 540 = 1500 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 18 × 84 = 1510 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 855 + 209 = 1069 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 68 × 22 = 1493 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 656 + 287 = 943 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 52 × 20 = 1043 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 16 × 16 = 256 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 78 × 83 = 6474 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 894 + 362 = 1256 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 637 + 774 = 1415 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 62 × 34 = 2108 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 61 × 25 = 1534 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 759 + 205 = 967 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 525 + 950 = 1472 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 443 + 197 = 640 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 955 + 272 = 1223 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 291 + 772 = 1066 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 90 × 61 = 5490 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 74 × 21 = 1554 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 361 + 829 = 1189 right or wrong? (a) Right (b) Wrong

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