Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 386 · 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 45 × 73 = 3285 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 360 + 920 = 1280 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 907 + 435 = 1342 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 717 + 520 = 1229 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 77 × 20 = 1540 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 216 + 290 = 506 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 745 + 811 = 1556 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 35 × 72 = 2520 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 838 + 560 = 1395 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 29 × 97 = 2813 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 146 + 136 = 289 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 93 × 85 = 7909 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 24 × 28 = 672 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 980 + 526 = 1511 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 29 × 68 = 1963 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 98 × 48 = 4704 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 851 + 288 = 1140 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 43 × 99 = 4258 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 18 × 27 = 488 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 213 + 883 = 1096 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 57 × 46 = 2622 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 543 + 810 = 1353 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 529 + 911 = 1438 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 628 + 344 = 963 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 58 × 72 = 4174 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 30 × 72 = 2160 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 81 × 50 = 4059 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 416 + 645 = 1061 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 34 × 26 = 885 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 77 × 63 = 4844 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 72 × 26 = 1872 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 642 + 303 = 945 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 551 + 853 = 1410 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 67 × 96 = 6429 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 47 × 28 = 1316 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 40 × 78 = 3120 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 24 × 25 = 600 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 90 × 49 = 4413 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 754 + 213 = 967 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 33 × 32 = 1053 right or wrong? (a) Wrong (b) Right

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