Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 255 · 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 846 + 301 = 1149 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 12 × 82 = 984 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 45 × 16 = 719 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 38 × 79 = 3002 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 734 + 303 = 1037 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 354 + 672 = 1026 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 45 × 42 = 1890 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 97 × 22 = 2134 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 19 × 26 = 502 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 167 + 390 = 556 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 26 × 83 = 2158 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 532 + 783 = 1313 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 379 + 109 = 484 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 25 × 86 = 2159 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 463 + 252 = 713 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 920 + 149 = 1075 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 438 + 862 = 1300 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 12 × 84 = 1007 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 912 + 900 = 1818 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 67 × 75 = 5026 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 74 × 13 = 960 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 575 + 551 = 1126 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 719 + 121 = 840 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 427 + 366 = 793 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 71 × 78 = 5535 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 47 × 88 = 4145 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 63 × 59 = 3709 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 135 + 123 = 254 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 98 × 54 = 5292 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 99 × 92 = 9108 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 40 × 27 = 1080 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 12 × 16 = 187 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 916 + 535 = 1451 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 14 × 57 = 798 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 38 × 13 = 499 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 79 × 36 = 2844 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 286 + 852 = 1138 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 344 + 692 = 1036 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 456 + 925 = 1377 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 87 × 34 = 2958 right or wrong? (a) Right (b) Wrong

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