Lesson: Adding Numbers up to 100 Using Compensation Mathematics • 2nd Grade
In this lesson, we will learn how to add two numbers by breaking them apart and combining them to give us numbers that are easier to add.
We can find easier sums to help us add.
Find the missing number.
What is ?
Match the calculations which have the same answer.
Hint: What happens when you subtract the green ones from one addend and add them to the other?
Think about adding 47 and 15.
Pick a calculation that has the same answer.
Find the answer.