Adding Two 2-Digit Numbers by Making 10s

This lesson teaches how to add two-digit numbers vertically by decomposing numbers. It explains the concept of decomposition, the commutative property of addition, and provides examples using crayons and bees to illustrate the process. The lesson concludes with a summary of the key points covered.

What does it mean to decompose a number?

Explain the commutative property of addition with an example.

How do you add the ones place when adding 36 and 44?

Describe the process of adding the tens place in the example of 36 plus 44.

What is the final sum of 49 and 23, and how did you arrive at that answer?