the amount of medicine to give a patient
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He was a wise man and always had an adage for every situation, like "a bird in the hand is worth two in the bush".
If you estimate well, you get exactly 291.
explain how you would estimate to subtrac 189 from 643
348 is a pretty good estimate, I would say.
A situation equation is and estimate on what you think is the answer: At the chicken ranch this morning, there were 7,149 chicks. Later today, some more chicks hatched. Now the ranch has 8,945 chicks. How many new chicks hatched today? Situation equation: 1,700.