Grade one students are working towards fluency with addition and subtraction of numbers within 10. This week we learned to describe groups of objects using the phrase "one more" and then seeing that can be shown as + 1.
First graders are learning the different ways to put together numbers. They started with six and created number bonds with a total of six. Then we continued with the numbers seven, eight, and nine. In addition, we are learning to count on and to skip count by fives and tens.
This week second graders are learning mental strategies for addition and subtraction within 20. They have learned to make a ten to add and subtract within 20. They are applying their knowledge of sums and differences to 10, which they learned in grade one, to teen numbers. For example: 13 + 2 = (10+3) +2 = 10 + (3+2). Students learned they can use their knowledge of basic facts to add and subtract larger numbers. This understanding led to our next lesson in which students needed to subtract from 10 when there were not enough ones. For example when subtracting 12 -8, the student knows there are only two ones, so the student subtracts the 8 from the 10. So 12- 8 = 2 + 2. We used rekenreks in class to demonstrate the principal with great success. This strategy lays the foundation for understanding place value and paving the way for students to regroup numbers later in the year. We continued these strategies for addition and subtraction within 100.
Hello, I am Renee De Villez. This page is about the activities going on in my classroom. My audience consists of the parents of the students in my class. Other parents and teachers are welcome to read it as well.