Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 847 · 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 162 + 664 = 826 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 493 + 515 = 1008 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 25 × 24 = 598 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 71 × 35 = 2485 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 21 × 51 = 1071 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 91 × 22 = 2006 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 51 × 83 = 4234 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 60 × 17 = 1015 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 173 + 715 = 888 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 90 × 26 = 2347 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 852 + 627 = 1472 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 921 + 320 = 1241 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 997 + 418 = 1419 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 25 × 98 = 2450 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 82 × 86 = 7052 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 419 + 678 = 1097 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 613 + 194 = 803 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 885 + 252 = 1129 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 254 + 783 = 1037 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 635 + 324 = 960 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 296 + 485 = 781 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 893 + 228 = 1121 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 957 + 182 = 1139 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 18 × 22 = 401 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 16 × 81 = 1287 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 315 + 703 = 1018 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 93 × 20 = 1865 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 17 × 52 = 884 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 759 + 481 = 1240 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 39 × 89 = 3472 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 67 × 78 = 5226 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 23 × 17 = 391 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 674 + 790 = 1469 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 674 + 438 = 1112 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 21 × 59 = 1239 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 82 × 17 = 1394 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 31 × 32 = 984 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 30 × 59 = 1770 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 40 × 26 = 1040 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 111 + 422 = 533 right or wrong? (a) Wrong (b) Right

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