Post 5
Post 5 On Friday I taught a lesson on adding and subtracting decimals. It was my first lesson where my coordinating teacher observed me. I planned out the lesson the night before. Standard 5.NBT.7 I had up on the board 1, .1, and .01 magnetic discs. Students had their math notebooks and math textbooks. Books were closed to start. I said to the students, "Yesterday you learned about rounding decimals and today you will learn how to add and subtract decimals." To draw on prior knowledge I then asked and pointed to the 1, .1 and .01 and asked them what they represent. Then I asked, "When do you think we may need to add and subtract decimals?" The discs I had on the board equaled 2.63. I asked a student to tell me what number was made with the discs and explain how they came up with the answer. I then asked for a volunteer to come up and use discs to represent 3.84 underneath the 2.63. I asked, "If we add the them...