Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 841 · 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 176 + 890 = 1060 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 952 + 958 = 1907 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 636 + 483 = 1119 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 865 + 934 = 1796 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 32 × 18 = 576 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 125 + 683 = 811 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 91 × 32 = 2912 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 36 × 29 = 1041 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 73 × 41 = 2993 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 36 × 69 = 2484 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 949 + 254 = 1203 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 923 + 230 = 1161 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 221 + 609 = 830 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 720 + 339 = 1059 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 58 × 89 = 5157 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 159 + 335 = 495 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 21 × 41 = 862 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 287 + 190 = 483 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 566 + 329 = 895 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 585 + 915 = 1493 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 676 + 746 = 1422 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 29 × 57 = 1658 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 81 × 71 = 5751 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 14 × 54 = 756 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 204 + 963 = 1167 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 45 × 39 = 1755 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 25 × 49 = 1229 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 48 × 15 = 717 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 398 + 512 = 907 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 54 × 37 = 1998 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 45 × 78 = 3510 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 360 + 991 = 1351 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 591 + 912 = 1499 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 880 + 153 = 1033 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 428 + 253 = 677 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 716 + 788 = 1504 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 18 × 19 = 342 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 454 + 501 = 962 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 15 × 39 = 585 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 268 + 850 = 1118 right or wrong? (a) Right (b) Wrong

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