Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 507 · 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 945 + 734 = 1679 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 140 + 479 = 611 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 70 × 20 = 1400 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 391 + 847 = 1246 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 19 × 57 = 1082 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 81 × 83 = 6723 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 73 × 29 = 2117 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 78 × 63 = 4912 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 612 + 364 = 982 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 331 + 745 = 1067 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 60 × 55 = 3309 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 570 + 889 = 1458 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 43 × 37 = 1593 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 605 + 775 = 1380 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 250 + 527 = 777 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 63 × 63 = 3969 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 481 + 117 = 597 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 21 × 84 = 1764 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 58 × 82 = 4759 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 56 × 57 = 3184 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 15 × 69 = 1035 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 249 + 254 = 503 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 40 × 73 = 2920 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 74 × 85 = 6290 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 80 × 53 = 4240 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 882 + 724 = 1603 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 77 × 36 = 2777 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 448 + 925 = 1373 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 60 × 14 = 840 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 91 × 29 = 2639 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 33 × 42 = 1386 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 524 + 332 = 856 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 244 + 347 = 591 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 141 + 135 = 282 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 19 × 58 = 1102 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 133 + 750 = 889 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 298 + 721 = 1019 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 84 × 24 = 2016 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 323 + 462 = 790 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 65 × 65 = 4225 right or wrong? (a) Right (b) Wrong

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