Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 923 · 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 846 + 372 = 1216 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 67 × 41 = 2747 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 370 + 240 = 604 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 199 + 360 = 559 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 52 × 29 = 1508 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 316 + 124 = 440 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 82 × 50 = 4094 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 88 × 85 = 7480 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 341 + 888 = 1227 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 20 × 20 = 396 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 22 × 67 = 1480 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 73 × 46 = 3362 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 33 × 80 = 2634 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 179 + 173 = 352 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 750 + 260 = 1010 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 18 × 17 = 306 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 698 + 193 = 891 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 80 × 50 = 4000 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 96 × 46 = 4416 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 226 + 194 = 420 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 913 + 436 = 1349 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 459 + 745 = 1204 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 357 + 520 = 877 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 33 × 72 = 2376 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 97 × 31 = 3007 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 21 × 67 = 1408 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 638 + 262 = 900 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 84 × 19 = 1594 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 70 × 23 = 1614 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 52 × 82 = 4269 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 84 × 95 = 7980 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 72 × 50 = 3600 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 984 + 346 = 1330 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 65 × 38 = 2470 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 462 + 904 = 1366 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 99 × 22 = 2180 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 45 × 27 = 1215 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 23 × 73 = 1679 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 30 × 41 = 1227 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 313 + 453 = 766 right or wrong? (a) Wrong (b) Right

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