Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 84 · 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 175 + 118 = 297 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 38 × 26 = 988 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 844 + 634 = 1478 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 150 + 989 = 1139 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 367 + 696 = 1062 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 320 + 889 = 1215 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 771 + 632 = 1403 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 831 + 427 = 1257 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 404 + 195 = 599 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 360 + 140 = 498 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 71 × 98 = 6958 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 70 × 30 = 2108 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 439 + 139 = 583 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 981 + 431 = 1412 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 119 + 388 = 507 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 92 × 29 = 2668 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 508 + 807 = 1315 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 89 × 47 = 4183 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 24 × 46 = 1104 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 73 × 64 = 4672 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 18 × 74 = 1335 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 640 + 254 = 890 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 31 × 74 = 2286 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 50 × 47 = 2359 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 224 + 337 = 569 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 396 + 384 = 778 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 55 × 34 = 1870 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 897 + 967 = 1862 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 97 × 14 = 1358 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 12 × 21 = 253 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 963 + 268 = 1231 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 13 × 13 = 169 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 647 + 433 = 1080 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 44 × 61 = 2684 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 95 × 34 = 3236 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 42 × 16 = 672 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 41 × 12 = 484 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 61 × 43 = 2629 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 23 × 91 = 2089 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 18 × 85 = 1529 right or wrong? (a) Wrong (b) Right

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