Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 307 · 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 40 × 34 = 1360 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 143 + 919 = 1070 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 26 × 21 = 540 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 81 × 19 = 1539 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 489 + 661 = 1150 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 265 + 155 = 420 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 95 × 21 = 1995 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 114 + 174 = 281 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 51 × 44 = 2244 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 32 × 56 = 1792 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 33 × 70 = 2303 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 56 × 67 = 3760 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 325 + 333 = 658 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 84 × 46 = 3864 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 358 + 399 = 756 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 42 × 41 = 1718 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 81 × 35 = 2835 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 33 × 27 = 896 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 172 + 724 = 896 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 694 + 971 = 1664 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 734 + 892 = 1633 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 37 × 52 = 1923 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 175 + 571 = 748 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 490 + 459 = 949 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 30 × 60 = 1800 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 402 + 962 = 1361 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 24 × 99 = 2376 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 96 × 85 = 8154 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 59 × 33 = 1944 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 73 × 17 = 1241 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 59 × 78 = 4598 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 150 + 897 = 1051 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 20 × 44 = 883 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 899 + 326 = 1225 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 566 + 196 = 762 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 146 + 783 = 929 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 527 + 659 = 1177 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 930 + 232 = 1161 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 435 + 869 = 1300 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 415 + 525 = 940 right or wrong? (a) Right (b) Wrong

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