Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 881 · 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 77 × 92 = 7078 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 46 × 36 = 1653 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 30 × 73 = 2186 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 463 + 643 = 1106 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 328 + 945 = 1275 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 772 + 505 = 1272 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 498 + 951 = 1448 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 752 + 435 = 1184 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 230 + 568 = 796 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 922 + 488 = 1410 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 68 × 96 = 6527 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 82 × 73 = 5992 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 88 × 92 = 8096 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 856 + 954 = 1810 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 23 × 66 = 1518 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 326 + 583 = 909 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 539 + 848 = 1387 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 47 × 52 = 2441 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 34 × 92 = 3128 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 456 + 631 = 1092 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 75 × 46 = 3450 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 65 × 33 = 2144 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 42 × 78 = 3276 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 16 × 14 = 224 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 64 × 96 = 6148 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 650 + 393 = 1040 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 56 × 44 = 2456 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 927 + 691 = 1618 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 60 × 96 = 5757 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 166 + 999 = 1165 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 69 × 42 = 2907 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 20 × 44 = 880 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 54 × 64 = 3456 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 753 + 271 = 1024 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 350 + 490 = 840 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 85 × 29 = 2466 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 88 × 51 = 4488 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 525 + 491 = 1016 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 19 × 55 = 1045 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 54 × 90 = 4861 right or wrong? (a) Wrong (b) Right

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