Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 781 · 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 68 × 16 = 1083 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 53 × 86 = 4556 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 601 + 855 = 1456 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 466 + 746 = 1221 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 61 × 26 = 1586 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 68 × 25 = 1700 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 299 + 210 = 507 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 44 × 13 = 572 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 488 + 613 = 1101 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 673 + 787 = 1452 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 93 × 73 = 6789 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 86 × 25 = 2150 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 658 + 354 = 1009 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 81 × 35 = 2843 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 92 × 81 = 7452 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 50 × 15 = 750 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 99 × 15 = 1483 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 814 + 676 = 1490 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 24 × 97 = 2328 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 20 × 20 = 400 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 17 × 74 = 1254 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 94 × 12 = 1131 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 27 × 99 = 2673 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 22 × 78 = 1716 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 393 + 277 = 667 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 84 × 96 = 8064 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 653 + 745 = 1394 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 688 + 834 = 1522 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 56 × 48 = 2688 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 435 + 535 = 970 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 19 × 60 = 1140 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 547 + 802 = 1349 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 26 × 79 = 2059 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 54 × 32 = 1722 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 85 × 79 = 6723 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 845 + 220 = 1065 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 819 + 845 = 1664 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 50 × 35 = 1750 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 514 + 392 = 906 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 15 × 37 = 555 right or wrong? (a) Wrong (b) Right

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