Describe how u labeled the bar model and wrote a number sentence to solve the problem

Bar Model:

   It is used in elementary teaching  ,  for solving problems of addition, subtraction, Multiplication and Division by using various tools such as rectangles, squares or any polygons .

1. Addition

  4 + 2

Draw Four rectangles of same Dimension and two squares of same dimension .Dimension can be different also. Ask the children how many shapes are in all.

2. Subtraction

  6-4

Draw Six Rectangles of same Dimension.Color four of them in a single color and two of them in different color . Now in another picture keep only 4 rectangles having same color and keep the two rectangles apart .Ask the children how many rectangles are differently colored.  

1,645,493,059.35

step-by-step explanation:

which expression represents the approximate length of bc?

step-by-step explanation: