All this does not mean that we leave students to their own devices. We DO teach them different strategies for adding that are based on place value and decomposing numbers. This week, your child will reflect on how they add numbers and will learn 3 strategies (shown below) that will help strengthen their number sense. They will practice them in class and in their homework. Do not be surprised to hear your child say “But it’s easier the traditional way”. To them it may seem “easier” but based on some classroom observations, many are making mistakes adding this way. It is my goal to discuss this with them this week; it may seem easier because it is does not take as much time but their results are often not accurate (especially with subtraction). For the students who want to practice the traditional way, it could be used as a way for them to verify their answers. Students have also been taught to check their work with the calculator.

In the reading corner, there are 139 non-fiction books. Someone donated 206 nonfiction books to the classroom library. How many nonfiction books are there now?

139 + 206 =

100+200=300

30+0=30

9+6= 15

300+30+15=345 books

#2 Number Line Addition (including counting on by place value)

Mrs. Keller wants to find out how many students there are in buildings 400 and 600 combined. She knows that building 400 holds 235 students and building 600 hosts 248 students. How many students are in both buildings?

235 + 248 =

+200                                           +30                          +8

235                                                       435                          475                            483

# 3 Changing the ones

There are 178 fourth graders and 225 fifth graders on the playground. What is the total number of students on the playground?

178 + 225 =

I added 2 to 178 to get 180. I took the 2 from the ones place in 225.

Now I have 223.

I added 180 to 223 to get 403.