Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 730 · 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 98 × 67 = 6564 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 594 + 885 = 1485 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 49 × 97 = 4753 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 759 + 579 = 1338 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 18 × 24 = 432 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 584 + 129 = 713 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 632 + 724 = 1361 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 81 × 92 = 7452 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 35 × 64 = 2240 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 931 + 608 = 1541 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 463 + 286 = 749 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 26 × 74 = 1924 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 914 + 701 = 1611 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 160 + 290 = 454 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 76 × 38 = 2880 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 663 + 962 = 1628 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 14 × 67 = 941 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 63 × 16 = 1008 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 296 + 905 = 1198 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 429 + 737 = 1166 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 15 × 74 = 1110 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 865 + 865 = 1734 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 65 × 83 = 5386 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 890 + 252 = 1151 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 98 × 61 = 5976 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 76 × 99 = 7521 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 451 + 733 = 1188 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 355 + 612 = 967 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 811 + 950 = 1756 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 89 × 59 = 5257 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 342 + 893 = 1230 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 841 + 722 = 1563 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 49 × 37 = 1813 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 115 + 737 = 856 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 60 × 37 = 2213 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 485 + 327 = 806 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 31 × 29 = 890 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 99 × 50 = 4941 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 40 × 28 = 1125 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 944 + 998 = 1948 right or wrong? (a) Right (b) Wrong

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