Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 140 · 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 512 + 440 = 952 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 31 × 99 = 3069 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 705 + 846 = 1547 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 72 × 58 = 4172 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 632 + 666 = 1294 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 69 × 58 = 4011 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 40 × 18 = 716 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 301 + 561 = 863 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 985 + 908 = 1893 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 17 × 18 = 312 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 72 × 26 = 1865 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 902 + 201 = 1103 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 23 × 35 = 804 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 27 × 60 = 1620 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 60 × 26 = 1560 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 116 + 186 = 293 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 24 × 44 = 1056 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 955 + 250 = 1205 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 923 + 741 = 1657 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 598 + 245 = 843 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 208 + 358 = 575 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 87 × 28 = 2443 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 96 × 48 = 4608 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 211 + 154 = 360 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 39 × 83 = 3237 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 95 × 29 = 2752 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 95 × 12 = 1140 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 352 + 880 = 1232 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 75 × 61 = 4568 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 81 × 46 = 3723 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 574 + 797 = 1371 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 75 × 40 = 3000 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 24 × 24 = 574 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 387 + 903 = 1290 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 455 + 493 = 948 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 705 + 425 = 1126 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 835 + 550 = 1385 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 14 × 19 = 266 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 97 × 95 = 9213 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 20 × 13 = 258 right or wrong? (a) Wrong (b) Right

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