Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 201 · 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 14 × 43 = 602 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 453 + 543 = 996 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 24 × 91 = 2184 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 12 × 95 = 1140 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 93 × 95 = 8835 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 50 × 32 = 1609 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 616 + 367 = 983 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 94 × 85 = 7990 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 22 × 98 = 2156 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 364 + 893 = 1256 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 57 × 15 = 855 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 69 × 20 = 1374 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 54 × 80 = 4312 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 14 × 74 = 1036 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 90 × 51 = 4591 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 148 + 552 = 700 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 909 + 393 = 1302 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 180 + 948 = 1133 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 17 × 73 = 1241 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 41 × 31 = 1265 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 88 × 84 = 7399 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 126 + 949 = 1067 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 458 + 861 = 1319 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 32 × 55 = 1752 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 53 × 37 = 1958 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 56 × 94 = 5264 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 293 + 702 = 997 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 592 + 248 = 840 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 301 + 736 = 1034 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 28 × 49 = 1365 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 982 + 533 = 1518 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 842 + 601 = 1443 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 28 × 35 = 980 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 726 + 401 = 1121 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 60 × 71 = 4260 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 161 + 930 = 1088 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 689 + 497 = 1182 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 74 × 76 = 5624 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 226 + 351 = 577 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 844 + 512 = 1356 right or wrong? (a) Wrong (b) Right

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