Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 257 · 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 864 + 689 = 1553 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 771 + 248 = 1019 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 61 × 47 = 2867 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 632 + 817 = 1449 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 83 × 68 = 5644 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 74 × 98 = 7252 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 74 × 54 = 3994 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 331 + 866 = 1197 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 73 × 52 = 3799 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 90 × 48 = 4326 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 183 + 322 = 505 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 213 + 428 = 641 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 776 + 183 = 951 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 27 × 58 = 1566 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 119 + 966 = 1085 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 50 × 36 = 1800 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 809 + 413 = 1217 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 583 + 579 = 1158 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 593 + 310 = 903 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 859 + 344 = 1203 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 790 + 110 = 904 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 438 + 913 = 1358 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 698 + 943 = 1641 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 893 + 136 = 1034 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 833 + 232 = 1065 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 65 × 61 = 3959 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 120 + 344 = 464 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 978 + 825 = 1803 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 275 + 144 = 421 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 646 + 997 = 1646 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 353 + 421 = 774 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 818 + 287 = 1103 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 72 × 45 = 3237 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 834 + 385 = 1219 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 333 + 512 = 853 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 561 + 161 = 722 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 56 × 74 = 4144 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 926 + 152 = 1078 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 28 × 65 = 1812 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 869 + 886 = 1755 right or wrong? (a) Right (b) Wrong

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