Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 883 · 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 76 × 82 = 6240 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 54 × 40 = 2160 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 79 × 14 = 1106 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 38 × 29 = 1102 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 56 × 61 = 3416 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 703 + 992 = 1689 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 83 × 22 = 1826 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 349 + 922 = 1271 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 374 + 172 = 541 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 59 × 75 = 4425 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 29 × 23 = 660 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 63 × 79 = 4975 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 634 + 618 = 1260 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 317 + 333 = 650 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 46 × 28 = 1288 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 12 × 94 = 1123 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 671 + 597 = 1268 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 50 × 81 = 4050 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 21 × 93 = 1953 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 230 + 419 = 640 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 256 + 652 = 908 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 18 × 58 = 1053 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 306 + 270 = 583 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 304 + 962 = 1266 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 13 × 82 = 1069 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 262 + 185 = 447 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 872 + 514 = 1384 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 86 × 79 = 6798 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 69 × 63 = 4347 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 834 + 672 = 1503 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 45 × 70 = 3141 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 93 × 74 = 6882 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 26 × 30 = 772 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 107 + 952 = 1051 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 42 × 81 = 3404 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 269 + 340 = 609 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 86 × 61 = 5242 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 127 + 507 = 634 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 824 + 251 = 1070 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 290 + 303 = 601 right or wrong? (a) Wrong (b) Right

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