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.