Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 700 · 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 26 × 88 = 2288 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 785 + 690 = 1475 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 76 × 68 = 5159 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 20 × 56 = 1111 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 33 × 64 = 2112 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 910 + 178 = 1088 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 21 × 82 = 1731 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 81 × 94 = 7619 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 330 + 283 = 614 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 18 × 72 = 1298 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 30 × 57 = 1715 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 55 × 94 = 5178 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 197 + 148 = 344 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 16 × 22 = 352 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 678 + 623 = 1301 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 428 + 523 = 957 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 207 + 265 = 470 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 95 × 61 = 5795 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 71 × 53 = 3766 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 29 × 64 = 1856 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 40 × 74 = 2951 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 881 + 933 = 1805 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 464 + 974 = 1446 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 32 × 94 = 3008 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 48 × 84 = 4032 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 45 × 87 = 3915 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 92 × 66 = 6070 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 29 × 37 = 1071 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 89 × 90 = 8019 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 253 + 255 = 508 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 513 + 699 = 1219 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 64 × 44 = 2808 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 977 + 938 = 1915 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 186 + 209 = 395 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 726 + 324 = 1048 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 281 + 787 = 1067 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 320 + 525 = 845 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 29 × 74 = 2140 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 541 + 278 = 819 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 467 + 150 = 617 right or wrong? (a) Wrong (b) Right

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