Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 718 · 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 15 × 99 = 1485 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 23 × 16 = 374 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 704 + 559 = 1263 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 31 × 68 = 2099 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 49 × 43 = 2107 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 912 + 608 = 1520 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 176 + 970 = 1143 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 14 × 50 = 700 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 28 × 51 = 1426 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 49 × 34 = 1666 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 56 × 38 = 2120 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 19 × 77 = 1454 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 34 × 54 = 1833 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 64 × 35 = 2240 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 88 × 27 = 2376 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 940 + 555 = 1492 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 679 + 642 = 1321 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 12 × 27 = 324 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 76 × 43 = 3268 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 88 × 88 = 7735 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 40 × 36 = 1439 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 254 + 985 = 1239 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 156 + 248 = 404 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 96 × 33 = 3168 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 56 × 89 = 4975 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 236 + 243 = 479 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 52 × 46 = 2391 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 921 + 793 = 1714 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 179 + 645 = 824 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 618 + 789 = 1407 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 43 × 13 = 550 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 426 + 327 = 753 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 35 × 49 = 1706 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 521 + 524 = 1037 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 547 + 660 = 1207 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 46 × 90 = 4143 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 54 × 72 = 3888 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 186 + 984 = 1170 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 332 + 900 = 1232 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 405 + 874 = 1272 right or wrong? (a) Wrong (b) Right

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