Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 141 · 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 × 91 = 6914 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 60 × 21 = 1260 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 261 + 510 = 770 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 740 + 815 = 1548 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 262 + 546 = 815 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 33 × 47 = 1551 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 713 + 845 = 1558 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 95 × 90 = 8550 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 24 × 13 = 317 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 13 × 55 = 724 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 533 + 252 = 785 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 67 × 24 = 1603 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 68 × 21 = 1428 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 790 + 150 = 940 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 25 × 90 = 2242 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 47 × 34 = 1598 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 821 + 482 = 1311 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 96 × 13 = 1239 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 33 × 20 = 662 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 78 × 73 = 5694 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 35 × 57 = 1995 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 853 + 990 = 1843 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 95 × 45 = 4281 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 904 + 577 = 1481 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 187 + 906 = 1093 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 46 × 54 = 2484 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 91 × 64 = 5822 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 300 + 781 = 1081 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 14 × 94 = 1316 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 116 + 259 = 375 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 807 + 307 = 1114 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 14 × 37 = 518 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 31 × 58 = 1792 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 65 × 15 = 975 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 84 × 99 = 8316 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 802 + 283 = 1085 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 37 × 54 = 1989 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 212 + 917 = 1129 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 40 × 21 = 840 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 283 + 330 = 606 right or wrong? (a) Wrong (b) Right

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