Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 651 · 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 19 × 12 = 226 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 935 + 764 = 1699 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 239 + 198 = 437 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 51 × 37 = 1887 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 31 × 79 = 2449 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 370 + 380 = 750 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 904 + 410 = 1321 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 57 × 38 = 2161 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 18 × 36 = 648 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 73 × 18 = 1313 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 30 × 55 = 1650 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 550 + 956 = 1508 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 533 + 797 = 1336 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 169 + 358 = 527 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 69 × 57 = 3931 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 242 + 895 = 1137 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 57 × 73 = 4160 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 48 × 84 = 4032 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 30 × 48 = 1440 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 895 + 855 = 1750 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 394 + 725 = 1119 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 66 × 44 = 2904 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 43 × 66 = 2843 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 293 + 786 = 1079 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 961 + 469 = 1430 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 48 × 75 = 3600 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 603 + 768 = 1371 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 87 × 57 = 4967 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 145 + 120 = 269 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 598 + 237 = 827 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 968 + 813 = 1785 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 45 × 14 = 627 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 279 + 580 = 859 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 85 × 19 = 1615 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 507 + 182 = 689 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 82 × 35 = 2870 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 77 × 70 = 5390 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 119 + 875 = 994 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 706 + 480 = 1183 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 98 × 91 = 8918 right or wrong? (a) Right (b) Wrong

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