Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 855 · 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 692 + 112 = 804 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 39 × 24 = 936 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 37 × 46 = 1702 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 149 + 916 = 1065 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 84 × 41 = 3438 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 77 × 37 = 2849 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 303 + 490 = 793 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 408 + 972 = 1380 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 162 + 675 = 837 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 90 × 54 = 4858 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 98 × 54 = 5292 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 458 + 565 = 1025 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 629 + 468 = 1097 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 54 × 12 = 648 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 239 + 255 = 494 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 722 + 245 = 967 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 62 × 26 = 1612 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 35 × 94 = 3289 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 336 + 199 = 535 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 55 × 30 = 1650 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 966 + 754 = 1720 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 37 × 59 = 2183 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 20 × 47 = 940 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 44 × 88 = 3872 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 369 + 405 = 774 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 201 + 440 = 643 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 55 × 80 = 4400 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 52 × 65 = 3380 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 37 × 36 = 1332 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 86 × 59 = 5074 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 42 × 28 = 1172 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 48 × 70 = 3357 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 91 × 84 = 7644 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 17 × 35 = 595 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 22 × 98 = 2156 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 74 × 51 = 3767 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 79 × 27 = 2125 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 182 + 932 = 1123 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 140 + 846 = 979 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 71 × 55 = 3905 right or wrong? (a) Right (b) Wrong

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