Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 963 · 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 719 + 919 = 1638 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 58 × 32 = 1856 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 105 + 832 = 937 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 75 × 64 = 4800 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 451 + 920 = 1371 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 259 + 185 = 444 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 696 + 259 = 961 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 749 + 756 = 1505 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 577 + 351 = 920 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 49 × 23 = 1131 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 94 × 30 = 2821 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 91 × 33 = 3003 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 83 × 39 = 3237 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 90 × 78 = 7013 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 82 × 90 = 7380 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 160 + 405 = 565 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 56 × 82 = 4592 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 39 × 16 = 624 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 59 × 33 = 1947 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 34 × 14 = 485 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 970 + 559 = 1529 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 65 × 48 = 3120 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 86 × 65 = 5596 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 97 × 38 = 3686 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 56 × 53 = 2964 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 94 × 41 = 3854 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 495 + 137 = 632 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 45 × 57 = 2572 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 99 × 59 = 5841 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 368 + 124 = 492 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 625 + 245 = 877 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 467 + 447 = 914 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 221 + 109 = 330 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 175 + 813 = 988 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 113 + 417 = 521 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 735 + 781 = 1521 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 83 × 55 = 4574 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 21 × 42 = 882 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 111 + 125 = 236 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 824 + 111 = 929 right or wrong? (a) Wrong (b) Right

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