Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 323 · 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 23 × 21 = 487 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 62 × 20 = 1240 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 19 × 99 = 1888 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 71 × 64 = 4544 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 114 + 201 = 315 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 29 × 47 = 1365 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 564 + 991 = 1561 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 51 × 89 = 4544 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 462 + 979 = 1441 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 43 × 55 = 2365 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 50 × 55 = 2753 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 349 + 548 = 897 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 341 + 510 = 851 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 727 + 832 = 1556 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 109 + 384 = 493 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 778 + 310 = 1090 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 62 × 40 = 2480 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 93 × 48 = 4464 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 905 + 481 = 1386 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 600 + 178 = 778 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 90 × 34 = 3060 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 510 + 819 = 1335 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 600 + 310 = 910 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 24 × 47 = 1128 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 713 + 263 = 967 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 418 + 970 = 1388 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 46 × 41 = 1894 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 51 × 27 = 1377 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 499 + 933 = 1425 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 218 + 770 = 988 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 445 + 921 = 1366 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 272 + 482 = 754 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 44 × 17 = 748 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 53 × 99 = 5240 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 799 + 521 = 1320 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 115 + 342 = 457 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 942 + 626 = 1568 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 300 + 232 = 528 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 20 × 19 = 380 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 815 + 223 = 1038 right or wrong? (a) Wrong (b) Right

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