Answer:
1. 7810, 2. 8000, 3. 7800
Explanation:
1. 12 is closer to 10 than it is to 20
2. 812 is closer to 1000 (188 away from 1000)than it is to 0(812 away)
3. 812 is close to 800 than 900
Ten: 7,810
Hundred: 7,800
Thousand: 8,000
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