Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 222 · 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 212 + 411 = 623 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 23 × 29 = 667 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 13 × 14 = 182 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 81 × 69 = 5588 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 77 × 94 = 7239 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 692 + 237 = 929 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 40 × 89 = 3560 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 918 + 147 = 1065 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 815 + 581 = 1389 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 24 × 30 = 713 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 39 × 33 = 1290 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 82 × 37 = 3028 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 59 × 17 = 1003 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 834 + 891 = 1732 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 75 × 26 = 1950 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 724 + 234 = 958 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 54 × 89 = 4807 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 12 × 57 = 684 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 99 × 37 = 3663 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 351 + 398 = 749 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 35 × 81 = 2835 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 866 + 502 = 1375 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 69 × 35 = 2410 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 64 × 36 = 2313 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 12 × 29 = 355 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 810 + 163 = 973 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 89 × 97 = 8641 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 300 + 567 = 867 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 71 × 15 = 1067 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 720 + 790 = 1510 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 95 × 63 = 5985 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 91 × 36 = 3276 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 23 × 17 = 391 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 92 × 95 = 8740 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 50 × 62 = 3100 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 58 × 40 = 2320 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 89 × 47 = 4183 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 862 + 676 = 1538 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 94 × 44 = 4136 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 569 + 379 = 948 right or wrong? (a) Right (b) Wrong

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