Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 110 · 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 24 × 81 = 1944 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 59 × 75 = 4425 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 503 + 109 = 612 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 656 + 360 = 1016 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 872 + 370 = 1249 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 161 + 693 = 854 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 96 × 44 = 4224 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 40 × 49 = 1960 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 77 × 56 = 4312 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 40 × 75 = 3000 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 73 × 40 = 2921 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 768 + 399 = 1160 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 73 × 77 = 5627 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 275 + 680 = 955 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 852 + 400 = 1261 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 437 + 498 = 935 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 61 × 39 = 2371 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 72 × 59 = 4248 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 417 + 677 = 1090 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 539 + 705 = 1244 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 65 × 94 = 6110 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 48 × 35 = 1680 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 85 × 63 = 5355 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 24 × 31 = 744 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 925 + 365 = 1290 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 83 × 29 = 2402 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 79 × 56 = 4427 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 984 + 693 = 1677 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 45 × 37 = 1662 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 20 × 49 = 980 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 27 × 21 = 567 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 17 × 19 = 323 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 908 + 777 = 1694 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 96 × 72 = 6912 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 93 × 88 = 8193 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 36 × 13 = 476 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 114 + 509 = 621 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 180 + 889 = 1067 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 47 × 27 = 1272 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 37 × 70 = 2590 right or wrong? (a) Wrong (b) Right

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