Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 670 · 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 38 × 33 = 1254 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 56 × 28 = 1568 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 901 + 896 = 1792 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 966 + 257 = 1225 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 622 + 810 = 1441 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 348 + 522 = 864 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 722 + 242 = 964 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 892 + 625 = 1519 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 14 × 96 = 1345 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 604 + 423 = 1033 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 520 + 313 = 833 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 652 + 178 = 835 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 13 × 87 = 1131 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 422 + 401 = 823 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 24 × 15 = 369 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 67 × 91 = 6106 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 36 × 60 = 2169 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 51 × 59 = 3017 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 59 × 69 = 4071 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 336 + 715 = 1051 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 29 × 65 = 1881 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 361 + 700 = 1061 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 78 × 81 = 6318 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 533 + 613 = 1141 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 706 + 366 = 1072 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 35 × 37 = 1295 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 42 × 26 = 1097 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 16 × 44 = 704 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 68 × 31 = 2101 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 460 + 591 = 1054 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 321 + 145 = 466 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 90 × 43 = 3870 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 57 × 78 = 4448 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 927 + 724 = 1649 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 333 + 516 = 849 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 90 × 54 = 4855 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 98 × 45 = 4404 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 48 × 95 = 4560 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 12 × 19 = 235 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 660 + 942 = 1611 right or wrong? (a) Right (b) Wrong

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