Give a rough estimate ( by rounding off to nearest hundred ) and also a closer estimate ( by rounding off to nearest ten ).
1. 488 + 256 + 543
2. 6,789 ― 4,778
3. 6,900 + 4,422 + 3,333
4. 2,220 ― 4,400 ― 9,400
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Give a rough estimate ( by rounding off to nearest hundred ) and also a closer estimate ( by rounding off to nearest ten ).
1. 488 + 256 + 543
2. 6,789 ― 4,778
3. 6,900 + 4,422 + 3,333
4. 2,220 ― 4,400 ― 9,400
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