Add Hundreds Video

Ella got this trampoline as a birthday present. She likes to invite her friend Ben over to jump!

Ella and Ben spent 200 minutes jumping on Monday and 400 minutes on Tuesday. That sure is a long time! How long did Ella and Ben jump altogether? Let’s try adding 200 + 400.

What do you notice about the numbers 200 and 400? If you said that both numbers have two zeros, then you’re right! Both 200 and 400 have zeros in the tens and ones places. We can add these numbers together quickly by ignoring the zeros. In fact, let’s cross them out!

We know that 2 + 4 = 6. Let’s put the 6 in the hundreds place. Then put both missing zeros in the tens and ones places. There we go! 200 + 400 = 600. Wasn’t that easy?

We can check our sum using a thousand chart. Just put your finger on the larger addend. That’s 400! Then jump down 2 rows to add the smaller addend, 200. There we go! 600 is the sum.

Ella and Ben are at it again! They jumped for 500 minutes on Wednesday and 300 minutes on Thursday. How many minutes did they jump in total?

Both 500 and 300 have zeros in the tens and ones place, so let’s focus on the digits in the hundreds place! What is 5 + 3? That’s right, 8! That means Ella and Ben jumped for 800 minutes.

Can you check to see if our sum is correct? Where is the larger addend on this thousand chart? Oh, yes! There’s 500. Now jump down 3 rows and find our sum. We are right! The sum is 800.

It’s the weekend and Ella and Ben are a little tired from jumping all week. They jumped 100 minutes on Saturday and 100 minutes on Sunday. Do you know how many minutes they jumped altogether?

What should we do first? Good idea! We’ll cross out the zeros. Now what should we do? Oh, yes! Add the digits in the hundreds place. 1 + 1 = 2. Is 2 the answer? No way! We have to write the missing zeros. There we go! Ella and Ben jumped for 200 minutes over the weekend.

Can you check our sum using a thousand chart? Perfect! We start at 100 and jump down 1 row to add the other 100. Our sum is correct.

Great job jumping, Ella and Ben!