Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 859 · 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 195 + 585 = 780 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 37 × 44 = 1637 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 720 + 288 = 1011 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 720 + 347 = 1059 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 707 + 155 = 861 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 83 × 20 = 1660 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 94 × 82 = 7715 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 33 × 67 = 2211 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 323 + 234 = 556 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 843 + 319 = 1162 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 99 × 21 = 2071 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 852 + 208 = 1060 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 79 × 41 = 3239 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 600 + 649 = 1249 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 85 × 19 = 1615 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 766 + 252 = 1017 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 85 × 74 = 6290 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 36 × 52 = 1872 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 286 + 111 = 404 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 14 × 85 = 1190 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 607 + 378 = 985 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 423 + 732 = 1159 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 51 × 86 = 4384 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 58 × 70 = 4069 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 37 × 44 = 1633 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 223 + 958 = 1179 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 161 + 116 = 282 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 70 × 46 = 3225 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 41 × 95 = 3889 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 203 + 259 = 462 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 304 + 531 = 840 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 54 × 31 = 1670 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 258 + 440 = 698 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 846 + 527 = 1373 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 651 + 625 = 1280 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 12 × 42 = 504 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 822 + 284 = 1106 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 991 + 228 = 1223 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 926 + 323 = 1249 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 414 + 854 = 1268 right or wrong? (a) Wrong (b) Right

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