Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 755 · 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 74 × 42 = 3108 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 606 + 629 = 1235 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 357 + 501 = 858 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 836 + 745 = 1581 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 921 + 891 = 1812 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 171 + 972 = 1143 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 592 + 460 = 1052 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 589 + 356 = 945 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 96 × 22 = 2108 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 849 + 478 = 1324 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 22 × 26 = 578 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 36 × 23 = 828 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 627 + 375 = 994 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 811 + 171 = 985 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 73 × 23 = 1683 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 744 + 380 = 1124 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 14 × 74 = 1036 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 43 × 64 = 2755 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 71 × 16 = 1136 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 736 + 302 = 1038 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 334 + 407 = 733 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 83 × 33 = 2740 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 50 × 66 = 3300 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 53 × 37 = 1961 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 476 + 708 = 1184 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 701 + 762 = 1463 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 261 + 846 = 1107 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 23 × 13 = 299 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 914 + 214 = 1128 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 65 × 88 = 5712 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 644 + 364 = 1016 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 137 + 260 = 404 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 18 × 17 = 304 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 82 × 44 = 3607 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 60 × 80 = 4800 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 150 + 521 = 671 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 16 × 73 = 1168 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 289 + 510 = 799 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 96 × 36 = 3456 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 230 + 225 = 455 right or wrong? (a) Wrong (b) Right

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