Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 316 · 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 718 + 166 = 888 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 273 + 199 = 472 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 99 × 19 = 1887 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 35 × 73 = 2552 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 881 + 315 = 1196 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 430 + 118 = 550 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 51 × 52 = 2646 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 30 × 29 = 870 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 52 × 79 = 4117 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 30 × 45 = 1353 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 217 + 917 = 1129 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 44 × 80 = 3520 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 779 + 470 = 1249 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 939 + 632 = 1573 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 418 + 376 = 787 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 851 + 124 = 975 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 43 × 37 = 1591 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 86 × 55 = 4730 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 61 × 73 = 4451 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 366 + 386 = 752 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 49 × 54 = 2644 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 20 × 43 = 862 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 71 × 27 = 1922 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 683 + 898 = 1582 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 72 × 26 = 1872 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 46 × 73 = 3349 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 71 × 98 = 6961 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 445 + 656 = 1110 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 47 × 48 = 2256 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 405 + 245 = 650 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 956 + 168 = 1124 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 81 × 47 = 3800 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 41 × 53 = 2173 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 30 × 40 = 1200 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 88 × 40 = 3520 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 984 + 377 = 1369 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 151 + 155 = 306 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 551 + 173 = 724 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 93 × 28 = 2609 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 39 × 50 = 1946 right or wrong? (a) Right (b) Wrong

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