Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 869 · 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 245 + 184 = 429 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 110 + 355 = 465 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 85 × 86 = 7310 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 57 × 69 = 3930 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 97 × 35 = 3393 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 66 × 22 = 1451 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 89 × 39 = 3471 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 21 × 44 = 931 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 340 + 327 = 667 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 292 + 714 = 1006 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 43 × 13 = 559 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 85 × 17 = 1440 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 89 × 44 = 3916 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 907 + 480 = 1387 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 39 × 33 = 1285 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 86 × 47 = 4042 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 691 + 588 = 1279 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 314 + 332 = 646 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 50 × 85 = 4250 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 833 + 107 = 947 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 347 + 244 = 583 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 40 × 37 = 1484 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 67 × 25 = 1675 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 35 × 43 = 1505 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 556 + 666 = 1221 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 46 × 18 = 828 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 871 + 237 = 1108 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 922 + 452 = 1374 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 362 + 441 = 803 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 75 × 64 = 4800 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 503 + 415 = 918 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 741 + 679 = 1420 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 900 + 995 = 1895 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 75 × 66 = 4950 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 582 + 377 = 959 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 403 + 434 = 837 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 94 × 30 = 2825 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 74 × 99 = 7326 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 44 × 33 = 1452 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 21 × 54 = 1128 right or wrong? (a) Right (b) Wrong

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