Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 337 · 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 36 × 21 = 756 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 874 + 215 = 1080 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 187 + 654 = 849 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 23 × 97 = 2231 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 42 × 54 = 2268 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 77 × 32 = 2464 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 730 + 198 = 931 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 342 + 464 = 806 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 52 × 29 = 1505 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 114 + 192 = 301 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 44 × 92 = 4054 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 234 + 616 = 851 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 839 + 543 = 1382 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 90 × 61 = 5490 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 81 × 86 = 6975 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 138 + 988 = 1126 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 962 + 649 = 1606 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 460 + 625 = 1085 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 50 × 74 = 3700 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 37 × 62 = 2294 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 44 × 31 = 1373 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 22 × 94 = 2068 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 13 × 83 = 1079 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 229 + 731 = 960 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 12 × 63 = 759 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 952 + 474 = 1417 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 91 × 36 = 3272 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 77 × 85 = 6545 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 52 × 40 = 2071 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 96 × 12 = 1161 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 32 × 18 = 576 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 339 + 239 = 578 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 66 × 80 = 5280 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 947 + 942 = 1889 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 266 + 708 = 974 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 693 + 883 = 1574 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 741 + 754 = 1495 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 56 × 73 = 4088 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 78 × 72 = 5613 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 616 + 164 = 780 right or wrong? (a) Wrong (b) Right

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