Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 626 · 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 251 + 564 = 815 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 665 + 908 = 1579 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 165 + 595 = 760 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 843 + 714 = 1556 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 44 × 59 = 2594 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 39 × 54 = 2106 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 33 × 30 = 996 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 34 × 80 = 2726 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 94 × 64 = 6009 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 74 × 67 = 4959 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 29 × 56 = 1617 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 825 + 374 = 1199 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 186 + 697 = 874 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 479 + 586 = 1062 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 862 + 164 = 1026 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 304 + 109 = 407 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 62 × 90 = 5580 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 19 × 82 = 1562 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 85 × 25 = 2128 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 390 + 405 = 795 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 641 + 575 = 1221 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 82 × 33 = 2706 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 36 × 38 = 1372 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 15 × 44 = 660 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 20 × 67 = 1335 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 78 × 82 = 6396 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 24 × 15 = 369 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 745 + 908 = 1653 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 68 × 88 = 5977 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 311 + 158 = 469 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 163 + 270 = 433 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 30 × 85 = 2559 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 272 + 193 = 465 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 99 × 44 = 4356 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 87 × 31 = 2697 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 341 + 804 = 1140 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 442 + 530 = 972 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 94 × 30 = 2820 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 23 × 93 = 2139 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 946 + 469 = 1415 right or wrong? (a) Right (b) Wrong

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