Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 653 · 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 83 × 61 = 5064 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 97 × 98 = 9499 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 933 + 114 = 1049 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 28 × 37 = 1036 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 105 + 480 = 585 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 950 + 558 = 1508 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 77 × 41 = 3157 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 86 × 39 = 3349 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 40 × 64 = 2560 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 75 × 75 = 5625 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 17 × 17 = 291 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 17 × 56 = 952 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 210 + 186 = 396 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 335 + 633 = 968 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 274 + 643 = 915 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 27 × 51 = 1377 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 264 + 464 = 728 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 120 + 203 = 330 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 26 × 72 = 1881 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 76 × 54 = 4104 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 439 + 886 = 1325 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 19 × 79 = 1501 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 99 × 13 = 1296 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 618 + 688 = 1308 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 61 × 36 = 2196 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 256 + 714 = 970 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 979 + 997 = 1980 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 793 + 316 = 1109 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 96 × 27 = 2592 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 18 × 90 = 1620 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 746 + 546 = 1294 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 21 × 34 = 714 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 88 × 50 = 4400 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 116 + 714 = 830 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 848 + 998 = 1851 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 569 + 197 = 766 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 49 × 71 = 3480 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 511 + 880 = 1391 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 89 × 81 = 7209 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 981 + 358 = 1339 right or wrong? (a) Right (b) Wrong

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