Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 974 · 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 15 × 51 = 766 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 32 × 33 = 1056 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 65 × 94 = 6110 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 35 × 12 = 420 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 23 × 23 = 529 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 27 × 12 = 324 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 391 + 487 = 883 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 348 + 513 = 864 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 20 × 39 = 780 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 409 + 535 = 936 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 99 × 42 = 4160 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 676 + 409 = 1082 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 21 × 26 = 546 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 805 + 980 = 1785 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 194 + 917 = 1119 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 350 + 738 = 1088 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 20 × 71 = 1420 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 81 × 68 = 5508 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 763 + 876 = 1639 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 39 × 14 = 548 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 71 × 24 = 1711 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 78 × 63 = 4914 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 21 × 88 = 1848 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 421 + 276 = 702 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 747 + 349 = 1096 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 41 × 17 = 697 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 181 + 689 = 869 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 942 + 974 = 1923 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 702 + 208 = 918 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 427 + 460 = 887 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 58 × 75 = 4350 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 32 × 79 = 2528 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 97 × 75 = 7275 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 77 × 42 = 3234 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 60 × 26 = 1563 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 478 + 765 = 1243 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 249 + 541 = 789 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 32 × 98 = 3127 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 77 × 79 = 6086 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 605 + 367 = 974 right or wrong? (a) Right (b) Wrong

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