Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 194 · 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 624 + 447 = 1072 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 581 + 634 = 1215 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 445 + 193 = 637 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 761 + 245 = 1006 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 97 × 49 = 4746 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 73 × 84 = 6132 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 15 × 26 = 382 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 77 × 72 = 5544 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 41 × 71 = 2911 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 594 + 330 = 921 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 66 × 69 = 4554 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 76 × 28 = 2128 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 18 × 52 = 936 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 92 × 92 = 8463 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 37 × 31 = 1147 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 22 × 52 = 1143 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 33 × 96 = 3168 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 29 × 16 = 464 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 371 + 166 = 537 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 68 × 92 = 6256 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 22 × 29 = 629 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 78 × 66 = 5148 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 832 + 750 = 1590 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 34 × 93 = 3155 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 71 × 60 = 4263 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 77 × 48 = 3696 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 59 × 29 = 1711 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 69 × 98 = 6760 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 14 × 20 = 280 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 651 + 877 = 1534 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 90 × 32 = 2880 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 34 × 83 = 2822 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 52 × 17 = 886 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 854 + 362 = 1210 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 907 + 510 = 1420 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 317 + 206 = 531 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 44 × 32 = 1408 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 71 × 55 = 3905 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 241 + 347 = 585 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 212 + 214 = 421 right or wrong? (a) Right (b) Wrong

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