Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 824 · 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 55 × 40 = 2200 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 22 × 55 = 1219 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 873 + 275 = 1151 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 967 + 321 = 1288 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 14 × 13 = 182 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 31 × 78 = 2418 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 57 × 14 = 798 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 59 × 72 = 4248 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 36 × 56 = 2018 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 78 × 62 = 4836 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 430 + 418 = 843 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 31 × 29 = 893 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 48 × 86 = 4123 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 53 × 87 = 4611 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 68 × 12 = 815 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 412 + 388 = 794 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 89 × 15 = 1338 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 40 × 95 = 3801 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 278 + 609 = 885 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 670 + 491 = 1161 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 747 + 759 = 1509 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 749 + 900 = 1649 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 794 + 748 = 1549 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 318 + 999 = 1319 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 704 + 601 = 1296 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 95 × 65 = 6170 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 57 × 74 = 4222 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 750 + 636 = 1386 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 900 + 407 = 1308 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 716 + 739 = 1455 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 653 + 330 = 976 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 97 × 20 = 1940 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 688 + 484 = 1172 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 64 × 16 = 1015 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 38 × 97 = 3684 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 222 + 723 = 945 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 899 + 381 = 1285 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 39 × 31 = 1209 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 136 + 676 = 807 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 997 + 554 = 1551 right or wrong? (a) Right (b) Wrong

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