Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 743 · 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 981 + 746 = 1727 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 13 × 74 = 962 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 81 × 88 = 7136 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 953 + 270 = 1230 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 54 × 20 = 1073 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 67 × 69 = 4623 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 48 × 12 = 576 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 87 × 87 = 7577 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 56 × 29 = 1632 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 249 + 915 = 1161 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 47 × 18 = 843 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 941 + 674 = 1615 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 23 × 93 = 2139 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 27 × 82 = 2219 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 73 × 60 = 4380 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 66 × 20 = 1320 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 637 + 713 = 1357 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 44 × 42 = 1848 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 21 × 49 = 1029 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 21 × 37 = 777 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 323 + 660 = 983 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 386 + 764 = 1145 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 75 × 66 = 4950 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 984 + 201 = 1185 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 65 × 58 = 3770 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 132 + 454 = 586 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 77 × 63 = 4851 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 962 + 250 = 1212 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 651 + 615 = 1267 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 753 + 491 = 1243 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 15 × 50 = 749 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 199 + 952 = 1145 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 97 × 41 = 3977 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 521 + 334 = 855 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 178 + 397 = 569 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 44 × 85 = 3740 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 46 × 83 = 3818 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 694 + 179 = 881 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 993 + 470 = 1463 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 45 × 12 = 531 right or wrong? (a) Right (b) Wrong

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