Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 697 · 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 63 × 69 = 4347 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 147 + 818 = 965 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 404 + 407 = 811 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 57 × 70 = 3991 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 95 × 19 = 1805 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 192 + 133 = 325 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 96 × 86 = 8256 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 57 × 79 = 4505 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 57 × 50 = 2843 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 115 + 141 = 252 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 365 + 439 = 811 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 340 + 829 = 1168 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 15 × 84 = 1265 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 63 × 34 = 2142 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 51 × 30 = 1528 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 84 × 20 = 1671 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 227 + 902 = 1129 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 345 + 135 = 481 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 511 + 559 = 1070 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 811 + 547 = 1358 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 80 × 94 = 7520 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 13 × 93 = 1209 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 53 × 85 = 4505 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 261 + 614 = 882 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 99 × 90 = 8906 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 86 × 19 = 1625 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 889 + 116 = 1003 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 882 + 139 = 1023 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 935 + 531 = 1466 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 50 × 61 = 3050 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 278 + 880 = 1149 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 204 + 748 = 952 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 26 × 72 = 1873 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 24 × 80 = 1919 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 156 + 617 = 781 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 44 × 31 = 1364 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 964 + 240 = 1204 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 576 + 287 = 864 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 827 + 374 = 1201 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 402 + 876 = 1283 right or wrong? (a) Right (b) Wrong

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