Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 749 · 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 434 + 362 = 796 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 61 × 43 = 2623 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 42 × 54 = 2277 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 794 + 360 = 1154 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 78 × 43 = 3354 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 550 + 113 = 663 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 720 + 226 = 946 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 69 × 15 = 1026 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 609 + 520 = 1129 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 663 + 545 = 1208 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 49 × 33 = 1617 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 69 × 36 = 2484 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 33 × 20 = 664 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 97 × 18 = 1738 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 19 × 97 = 1843 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 953 + 608 = 1561 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 173 + 249 = 422 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 557 + 190 = 747 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 32 × 69 = 2204 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 18 × 54 = 972 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 26 × 40 = 1040 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 41 × 36 = 1478 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 29 × 20 = 580 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 84 × 14 = 1176 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 801 + 913 = 1712 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 775 + 887 = 1665 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 180 + 274 = 454 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 88 × 32 = 2816 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 84 × 85 = 7146 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 60 × 67 = 4020 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 53 × 76 = 4028 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 391 + 891 = 1289 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 168 + 867 = 1037 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 84 × 69 = 5791 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 128 + 287 = 415 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 28 × 55 = 1540 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 224 + 842 = 1058 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 65 × 61 = 3965 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 759 + 300 = 1059 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 91 × 20 = 1823 right or wrong? (a) Right (b) Wrong

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