Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 615 · 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 605 + 704 = 1318 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 930 + 641 = 1563 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 476 + 769 = 1245 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 20 × 44 = 880 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 21 × 99 = 2079 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 563 + 418 = 981 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 23 × 21 = 476 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 15 × 19 = 279 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 658 + 205 = 865 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 78 × 59 = 4604 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 31 × 51 = 1575 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 704 + 375 = 1079 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 40 × 63 = 2520 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 56 × 47 = 2631 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 90 × 20 = 1800 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 83 × 45 = 3735 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 354 + 299 = 659 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 566 + 506 = 1072 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 420 + 248 = 668 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 872 + 270 = 1139 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 220 + 993 = 1220 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 763 + 780 = 1547 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 25 × 15 = 375 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 33 × 49 = 1619 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 911 + 826 = 1737 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 12 × 37 = 444 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 569 + 651 = 1220 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 22 × 64 = 1408 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 237 + 190 = 423 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 498 + 125 = 623 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 113 + 837 = 950 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 985 + 733 = 1726 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 39 × 73 = 2847 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 56 × 28 = 1568 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 43 × 30 = 1290 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 115 + 135 = 249 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 35 × 23 = 805 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 853 + 760 = 1613 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 97 × 60 = 5825 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 584 + 874 = 1462 right or wrong? (a) Wrong (b) Right

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