Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 394 · 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 68 × 77 = 5236 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 86 × 56 = 4819 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 730 + 457 = 1184 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 74 × 67 = 4958 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 15 × 88 = 1320 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 312 + 110 = 424 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 947 + 461 = 1403 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 697 + 164 = 861 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 24 × 44 = 1056 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 46 × 27 = 1242 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 12 × 15 = 188 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 106 + 627 = 734 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 191 + 779 = 970 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 67 × 27 = 1809 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 31 × 69 = 2134 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 237 + 109 = 345 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 534 + 173 = 707 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 26 × 69 = 1794 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 69 × 21 = 1444 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 528 + 180 = 708 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 301 + 776 = 1077 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 517 + 185 = 702 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 283 + 333 = 616 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 28 × 65 = 1820 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 479 + 490 = 969 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 39 × 65 = 2535 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 859 + 947 = 1806 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 262 + 588 = 851 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 291 + 409 = 700 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 698 + 259 = 957 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 590 + 521 = 1111 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 71 × 69 = 4899 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 124 + 704 = 822 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 26 × 17 = 447 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 563 + 434 = 997 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 121 + 132 = 253 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 54 × 68 = 3672 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 348 + 824 = 1180 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 25 × 31 = 779 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 889 + 527 = 1420 right or wrong? (a) Right (b) Wrong

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