Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 566 · 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 15 × 62 = 930 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 609 + 770 = 1383 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 12 × 22 = 264 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 558 + 847 = 1405 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 890 + 275 = 1165 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 56 × 96 = 5376 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 84 × 88 = 7394 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 20 × 79 = 1580 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 91 × 86 = 7835 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 80 × 35 = 2800 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 661 + 979 = 1640 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 92 × 40 = 3680 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 73 × 37 = 2702 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 532 + 419 = 955 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 73 × 98 = 7148 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 364 + 319 = 679 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 173 + 717 = 890 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 116 + 316 = 432 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 24 × 79 = 1898 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 435 + 415 = 848 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 954 + 773 = 1725 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 219 + 960 = 1179 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 812 + 598 = 1410 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 69 × 36 = 2483 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 47 × 73 = 3422 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 66 × 83 = 5470 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 323 + 454 = 777 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 21 × 16 = 336 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 672 + 228 = 900 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 973 + 179 = 1152 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 32 × 75 = 2400 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 61 × 97 = 5917 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 629 + 508 = 1138 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 168 + 446 = 614 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 306 + 656 = 962 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 214 + 805 = 1010 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 566 + 192 = 752 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 296 + 888 = 1177 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 55 × 27 = 1485 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 143 + 192 = 342 right or wrong? (a) Wrong (b) Right

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