Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 865 · 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 × 94 = 7234 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 778 + 350 = 1132 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 20 × 44 = 879 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 246 + 191 = 437 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 44 × 29 = 1276 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 95 × 89 = 8447 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 853 + 701 = 1554 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 44 × 44 = 1939 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 911 + 349 = 1260 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 29 × 95 = 2764 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 27 × 67 = 1811 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 332 + 361 = 692 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 752 + 198 = 950 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 219 + 708 = 927 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 911 + 960 = 1871 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 50 × 28 = 1406 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 127 + 727 = 847 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 853 + 176 = 1029 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 92 × 96 = 8832 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 892 + 829 = 1721 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 40 × 76 = 3043 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 89 × 75 = 6675 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 897 + 849 = 1742 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 159 + 501 = 655 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 59 × 55 = 3245 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 696 + 842 = 1544 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 43 × 56 = 2415 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 51 × 67 = 3424 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 18 × 73 = 1311 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 30 × 28 = 840 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 31 × 96 = 2976 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 66 × 71 = 4686 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 93 × 74 = 6884 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 253 + 301 = 554 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 120 + 413 = 534 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 500 + 358 = 858 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 15 × 96 = 1448 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 39 × 77 = 3003 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 72 × 84 = 6049 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 65 × 69 = 4485 right or wrong? (a) Right (b) Wrong

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