Addition

We can add double digit numbers using our place value charts and our white boards!
Then we check our answer with our partners!

We can play the race to 40 game ...it teaches us about regrouping!

 

1.NBT.C.4

Number & Operations in Base Ten
Use place value understanding and properties of operations to add and subtract.

4. Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of 10, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used. Understand that in adding two-digit numbers, one adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten.


double digit addition without regrouping

Khan Academy on addition with regrouping

Why did the math book look so sad?
Because it had so many problems..

Q: How can you make seven even?
A: Take away the “S”

Q. What U.S. state has the most maths teachers?
A. Mathachussets.