Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 890 · 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 13 × 60 = 780 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 77 × 51 = 3921 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 90 × 40 = 3600 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 172 + 951 = 1123 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 53 × 23 = 1215 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 757 + 684 = 1448 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 96 × 28 = 2688 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 21 × 93 = 1945 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 91 × 89 = 8100 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 324 + 830 = 1152 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 19 × 95 = 1808 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 220 + 800 = 1019 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 42 × 74 = 3105 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 97 × 61 = 5909 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 30 × 84 = 2525 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 788 + 327 = 1115 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 808 + 667 = 1475 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 309 + 588 = 897 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 160 + 765 = 917 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 87 × 70 = 6086 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 63 × 56 = 3528 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 20 × 57 = 1140 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 27 × 55 = 1479 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 23 × 56 = 1295 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 303 + 201 = 504 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 799 + 629 = 1428 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 535 + 506 = 1050 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 947 + 838 = 1786 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 512 + 147 = 668 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 39 × 90 = 3510 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 42 × 44 = 1855 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 53 × 92 = 4876 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 363 + 956 = 1328 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 71 × 34 = 2423 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 57 × 16 = 912 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 27 × 99 = 2678 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 115 + 253 = 368 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 366 + 767 = 1135 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 37 × 96 = 3553 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 42 × 27 = 1133 right or wrong? (a) Right (b) Wrong

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