Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 860 · 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 742 + 638 = 1380 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 90 × 98 = 8820 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 792 + 608 = 1398 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 56 × 62 = 3466 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 74 × 54 = 3996 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 22 × 92 = 2024 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 62 × 82 = 5085 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 31 × 57 = 1767 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 13 × 46 = 598 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 42 × 96 = 4032 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 871 + 555 = 1424 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 640 + 928 = 1570 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 557 + 202 = 753 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 176 + 301 = 477 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 876 + 106 = 982 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 303 + 120 = 423 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 98 × 88 = 8624 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 759 + 492 = 1245 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 719 + 121 = 840 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 21 × 42 = 879 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 51 × 45 = 2295 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 30 × 27 = 802 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 696 + 408 = 1106 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 65 × 27 = 1755 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 733 + 279 = 1012 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 68 × 92 = 6247 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 127 + 649 = 777 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 76 × 82 = 6232 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 427 + 162 = 586 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 51 × 78 = 3978 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 97 × 45 = 4360 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 15 × 85 = 1283 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 111 + 840 = 956 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 311 + 484 = 795 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 54 × 99 = 5340 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 479 + 145 = 624 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 65 × 49 = 3185 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 145 + 992 = 1137 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 923 + 694 = 1617 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 82 × 37 = 3034 right or wrong? (a) Wrong (b) Right

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