Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 399 · 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 846 + 927 = 1774 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 17 × 29 = 496 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 841 + 416 = 1257 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 75 × 68 = 5100 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 52 × 98 = 5096 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 510 + 272 = 782 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 74 × 49 = 3617 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 995 + 703 = 1698 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 19 × 73 = 1387 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 132 + 287 = 419 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 26 × 87 = 2268 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 94 × 98 = 9217 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 28 × 85 = 2380 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 53 × 93 = 4929 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 90 × 58 = 5217 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 859 + 303 = 1156 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 34 × 81 = 2747 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 93 × 37 = 3448 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 168 + 623 = 791 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 679 + 665 = 1351 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 430 + 560 = 990 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 56 × 51 = 2864 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 926 + 853 = 1779 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 751 + 426 = 1177 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 89 × 90 = 8001 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 731 + 280 = 1011 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 14 × 52 = 728 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 105 + 800 = 909 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 570 + 113 = 683 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 54 × 31 = 1675 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 96 × 28 = 2688 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 99 × 95 = 9405 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 62 × 75 = 4650 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 16 × 96 = 1536 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 88 × 59 = 5192 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 28 × 85 = 2371 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 288 + 791 = 1079 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 74 × 42 = 3116 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 82 × 81 = 6642 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 325 + 922 = 1247 right or wrong? (a) Right (b) Wrong

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