Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 612 · 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 21 × 76 = 1596 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 47 × 20 = 933 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 43 × 98 = 4205 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 89 × 62 = 5518 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 390 + 674 = 1066 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 54 × 91 = 4910 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 187 + 416 = 605 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 533 + 116 = 647 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 375 + 422 = 796 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 720 + 344 = 1070 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 481 + 467 = 947 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 201 + 847 = 1046 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 67 × 84 = 5628 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 40 × 71 = 2840 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 38 × 75 = 2850 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 33 × 84 = 2763 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 648 + 669 = 1317 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 24 × 61 = 1464 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 922 + 952 = 1874 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 14 × 74 = 1036 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 680 + 302 = 989 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 60 × 25 = 1500 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 665 + 508 = 1173 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 792 + 963 = 1755 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 15 × 95 = 1425 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 84 × 93 = 7821 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 93 × 16 = 1488 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 78 × 77 = 5998 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 97 × 14 = 1358 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 735 + 106 = 841 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 251 + 204 = 455 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 586 + 324 = 901 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 113 + 321 = 434 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 475 + 895 = 1370 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 56 × 65 = 3640 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 638 + 793 = 1433 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 79 × 72 = 5688 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 370 + 475 = 845 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 92 × 60 = 5521 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 79 × 75 = 5921 right or wrong? (a) Right (b) Wrong

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