Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 317 · 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 85 × 84 = 7140 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 935 + 230 = 1157 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 162 + 106 = 268 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 613 + 983 = 1596 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 250 + 469 = 719 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 611 + 381 = 992 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 367 + 270 = 637 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 39 × 28 = 1095 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 53 × 42 = 2223 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 34 × 78 = 2652 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 44 × 24 = 1058 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 68 × 30 = 2040 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 943 + 704 = 1642 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 61 × 64 = 3904 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 12 × 66 = 789 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 711 + 854 = 1565 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 913 + 836 = 1757 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 732 + 894 = 1628 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 36 × 33 = 1182 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 616 + 633 = 1249 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 695 + 288 = 983 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 45 × 57 = 2565 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 411 + 891 = 1302 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 30 × 89 = 2670 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 96 × 75 = 7200 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 52 × 93 = 4836 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 50 × 37 = 1850 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 55 × 82 = 4503 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 20 × 96 = 1920 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 38 × 40 = 1520 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 37 × 72 = 2664 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 60 × 89 = 5340 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 99 × 31 = 3069 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 992 + 611 = 1599 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 39 × 48 = 1869 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 981 + 745 = 1726 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 63 × 38 = 2401 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 843 + 682 = 1520 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 594 + 840 = 1436 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 13 × 15 = 188 right or wrong? (a) Wrong (b) Right

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