Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 346 · 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 50 × 85 = 4250 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 30 × 72 = 2160 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 86 × 58 = 4981 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 18 × 90 = 1620 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 86 × 89 = 7660 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 356 + 233 = 594 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 21 × 39 = 819 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 902 + 984 = 1895 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 813 + 157 = 970 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 890 + 497 = 1385 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 89 × 18 = 1594 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 165 + 446 = 620 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 15 × 64 = 960 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 56 × 18 = 1008 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 282 + 790 = 1063 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 181 + 838 = 1019 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 38 × 40 = 1519 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 228 + 569 = 797 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 531 + 254 = 785 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 350 + 154 = 504 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 548 + 683 = 1235 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 24 × 30 = 720 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 307 + 352 = 659 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 94 × 67 = 6298 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 68 × 86 = 5848 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 717 + 577 = 1297 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 452 + 329 = 781 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 183 + 352 = 538 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 14 × 81 = 1140 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 572 + 961 = 1533 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 791 + 837 = 1628 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 59 × 66 = 3901 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 31 × 87 = 2688 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 90 × 40 = 3600 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 79 × 12 = 948 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 85 × 50 = 4241 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 56 × 98 = 5496 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 81 × 34 = 2754 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 28 × 95 = 2669 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 447 + 158 = 602 right or wrong? (a) Wrong (b) Right

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