First, 289 chicks were hatched on the first day, and 125 chicks were hatched on the second day. List the formula 289+ 125, find the number of chickens hatched the next day, and then add these two days to solve the problem. According to the number of eggs left = the number of eggs-the number of chickens hatched every two days, this formula can be used to solve the problem.

Knowledge points of mathematical addition and subtraction

When two numbers are added, the number remains the same: if one of the two added numbers increases, the other number will decrease, and how much one number increases, the other number will decrease. When two numbers are added, one of them remains the same, and if the other number changes, the number will also change, and the result will change as much as the addend.

Subtract one number from another and keep the reduction constant: if the minuend increases, the result will also increase, and the result will increase as much as the minuend increases; When the minuend is reduced, the result is also reduced, and the result is also reduced by how much the minuend is. Subtract one number from another and keep the minuend unchanged: if meiosis increases, the result will decrease, and the result will decrease as much as meiosis increases.

If meiosis decreases, the results increase, and the results increase by how much meiosis decreases. Subtract one number from another and keep this number unchanged: the minuend will increase as much as it increases; As much as the minuend is reduced, the minuend will also be reduced.