Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 455 · 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 242 + 949 = 1191 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 50 × 28 = 1400 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 278 + 106 = 393 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 58 × 85 = 4938 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 298 + 142 = 447 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 99 × 71 = 7029 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 29 × 41 = 1189 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 517 + 199 = 716 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 436 + 129 = 562 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 64 × 77 = 4921 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 37 × 33 = 1224 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 876 + 220 = 1096 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 25 × 83 = 2071 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 32 × 86 = 2756 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 58 × 97 = 5635 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 762 + 226 = 981 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 55 × 82 = 4512 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 404 + 541 = 945 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 55 × 16 = 880 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 77 × 22 = 1694 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 92 × 59 = 5428 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 71 × 16 = 1136 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 29 × 20 = 580 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 459 + 596 = 1053 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 46 × 59 = 2718 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 694 + 861 = 1555 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 803 + 357 = 1160 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 92 × 76 = 6992 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 64 × 86 = 5497 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 436 + 167 = 603 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 87 × 73 = 6353 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 726 + 274 = 1000 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 37 × 71 = 2636 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 15 × 49 = 743 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 12 × 47 = 570 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 35 × 20 = 700 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 50 × 18 = 893 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 908 + 879 = 1787 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 62 × 93 = 5766 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 559 + 133 = 692 right or wrong? (a) Wrong (b) Right

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