Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 759 · 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 880 + 902 = 1782 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 969 + 211 = 1175 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 227 + 327 = 554 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 844 + 186 = 1039 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 121 + 456 = 577 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 37 × 73 = 2706 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 24 × 23 = 553 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 264 + 791 = 1055 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 75 × 46 = 3448 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 502 + 870 = 1366 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 958 + 470 = 1425 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 33 × 48 = 1584 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 93 × 17 = 1579 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 80 × 56 = 4480 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 16 × 93 = 1497 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 241 + 842 = 1082 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 962 + 981 = 1943 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 314 + 940 = 1256 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 437 + 789 = 1232 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 37 × 42 = 1554 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 18 × 66 = 1197 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 39 × 46 = 1787 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 89 × 70 = 6239 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 29 × 95 = 2764 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 299 + 795 = 1091 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 746 + 825 = 1570 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 292 + 540 = 833 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 13 × 85 = 1105 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 13 × 44 = 572 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 50 × 45 = 2249 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 806 + 822 = 1632 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 587 + 287 = 875 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 36 × 56 = 2014 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 83 × 85 = 7055 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 76 × 13 = 988 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 751 + 271 = 1022 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 56 × 31 = 1736 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 283 + 895 = 1178 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 12 × 12 = 142 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 877 + 470 = 1347 right or wrong? (a) Right (b) Wrong

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