common core standards
I am very frustrated with common core standard, I am searching hundred web site I could not find anyone that explain with real # how to do it. They took nice about it, but not practices I went to Barnes & Nobles to find a book, no good luck, I found the book it said common core standard but the exercise are regular.
I do not what it is the mystery. I see my son's homework, he answered the math correct, but the concept he did not get . Example 20-9= 11, from ten what it is the solution and from nine which is the solution. Please someone can help me to understand and help my son 6 years old. I will appreciate.