Partitioning to Add

"The sun is so warm, it's perfect for this walk!" "And look at these mushrooms!" Mr. Squeaks and Imani are out for a walk when Mr. Squeaks sees something that catches his eye. While exploring the mushrooms he suddenly realises that he's lost! "Imani? IMANI!" Mr. Squeaks needs a strategy to help him. He can add the different mushrooms to count his way back! Let's learn about "Partitioning to add" to help Mr. Squeaks. There are different strategies that you can use to solve addition equations. One is to partition a number when adding. You may know about the tens frame and that when we fill all of the boxes, we have ten. Let's use the tens frame to help us as we partition to add! Mr. Squeaks passed twenty-six red mushrooms first and then fifteen purple mushrooms. How many mushrooms has he passed in total? We can start by creating an equation, or number sentence. Which is twenty-six plus fifteen. Next, we can take the smaller addend, or number, and break it apart, or PARTITION it, to make smaller numbers. We can take fifteen and partition it to make a ten and a five. Now we have twenty-six plus ten plus five, which may be easier to add. Then, solve using the tens frame. While there are different ways to add, in this video we will add by tens and count on. What is twenty-six plus ten? Thirty-six. Now, we can add thirty-six plus five, which is forty-one. That means twenty-six plus fifteen equals forty-one. "Okay, I've passed forty-one mushrooms, I can't be far." "Wait, I didn't pass green mushrooms yet." Mr. Squeaks just saw thirty-two green mushrooms and then twelve brown ones. How many mushrooms did he pass? Start by creating an equation. We can create thirty-two plus twelve. Next, take the smaller addend and break it apart, or PARTITION it. Here we can partition twelve and make a ten and a one. Now we have thirty-two plus ten plus two. Then, solve using the tens frame. What is thirty-two plus ten? Forty-two! What is forty-two plus two? Forty-four! So, Mr. Squeaks has passed forty-four mushrooms. "I MUST be close now!." "MORE MUSHROOMS?" We can partition again to help Mr. Squeaks one last time. Mr. Squeaks saw forty-seven spotted mushrooms and seventeen small ones. How many mushrooms should he add? Remember to start by creating an equation. We can create forty-seven plus seventeen. Next, take the smaller addend and partition it to make it even smaller. Here we can take seventeen and make one ten and seven ones. Now we have forty-seven plus ten plus seven. What is forty-seven plus ten? Fifty-seven What is fifty-seven plus seven? Sixty-four. Mr. Squeaks needs to add sixty-four mushrooms to his list. Let's review! When partitioning to add, start by creating an equation. Next, take the smaller addend and break it apart, or PARTITION it, to make even smaller addends. Don't forget to fill the tens frame with the smaller addends! Then, solve using the new equation. In this video we added by tens and counted on. Now, I wonder how Mr. Squeaks is doing. "IMANI! I missed you! I thought I was lost forever!"

"I-imani? That's you, right?" "Surprise! It's me!"