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You do not need to estimate it - you can calculate its exact value! 6/7 divided by 2 = 3/7
When you subtract 16 2/3 from 7 7/8 you will get 211/24 as a mixed number.
To subtract 9 from 7, you would first need to understand that 7 is a smaller number than 9. In order to perform the subtraction, you would need to borrow from a higher place value. In this case, you would need to borrow 1 from the tens place, making it 6 tens and adding it to the ones place, making it 17. Then, you would subtract 9 from 17, resulting in 8. Therefore, 7 minus 9 equals -2.
If you mean 8 and 7/12 subtract 2 and 3/8 then it is 6 and 5/24