Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 713 · 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 29 × 13 = 377 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 39 × 19 = 743 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 802 + 206 = 1008 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 767 + 214 = 981 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 55 × 23 = 1265 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 379 + 553 = 932 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 852 + 821 = 1666 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 946 + 654 = 1600 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 72 × 92 = 6624 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 93 × 12 = 1116 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 127 + 353 = 480 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 32 × 58 = 1850 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 69 × 25 = 1725 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 754 + 210 = 971 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 929 + 842 = 1778 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 817 + 767 = 1584 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 69 × 29 = 2004 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 88 × 70 = 6160 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 131 + 722 = 844 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 97 × 66 = 6402 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 27 × 50 = 1341 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 69 × 13 = 898 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 330 + 490 = 820 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 42 × 30 = 1260 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 82 × 66 = 5414 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 177 + 736 = 917 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 779 + 384 = 1157 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 88 × 84 = 7392 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 855 + 703 = 1564 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 172 + 189 = 361 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 934 + 355 = 1289 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 243 + 681 = 932 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 18 × 15 = 271 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 88 × 34 = 2994 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 41 × 39 = 1599 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 57 × 13 = 739 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 95 × 77 = 7315 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 44 × 34 = 1499 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 366 + 682 = 1048 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 51 × 58 = 2958 right or wrong? (a) Wrong (b) Right

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