Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 642 · 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 473 + 829 = 1302 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 73 × 17 = 1241 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 31 × 34 = 1050 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 789 + 960 = 1745 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 88 × 42 = 3696 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 40 × 67 = 2684 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 48 × 62 = 2976 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 468 + 359 = 827 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 56 × 97 = 5432 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 813 + 117 = 930 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 83 × 15 = 1254 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 69 × 64 = 4416 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 30 × 94 = 2820 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 43 × 34 = 1461 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 733 + 976 = 1713 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 46 × 57 = 2622 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 30 × 88 = 2640 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 808 + 576 = 1384 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 423 + 701 = 1129 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 734 + 598 = 1335 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 441 + 673 = 1120 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 646 + 785 = 1431 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 396 + 165 = 552 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 306 + 952 = 1251 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 51 × 87 = 4437 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 727 + 613 = 1340 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 12 × 18 = 216 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 162 + 256 = 418 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 18 × 15 = 270 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 59 × 34 = 2000 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 60 × 32 = 1924 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 46 × 49 = 2250 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 211 + 700 = 915 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 25 × 68 = 1700 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 53 × 54 = 2862 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 230 + 968 = 1198 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 673 + 535 = 1208 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 16 × 83 = 1328 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 387 + 472 = 865 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 262 + 486 = 754 right or wrong? (a) Wrong (b) Right

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