How many straws are there altogether on the place value chart?

How many straws are there?

How many straws are there altogether?

What number does the place value chart show?

Using place value with numbers to 50

﻿Comparing and ordering numbers within 50 Hello, everybody! I'm Lisadu, and we're going to do some wonderful math today. In this lesson, you will be comparing and ordering numbers within 50 using a place value chart. Now, let's get started. Welcome to today's lesson. And, today, we are going to be counting numbers within 50, comparing numbers within 50, and then, ordering numbers correctly, and an independent task. You will need a pencil and a paper, and a number square to 50 to help you. But first, here we have the numbers one, two, and three in numerals and in word form. Can you continue all the way to twenty writing them in numerals and word form? I want you to pause and have a go. Pause and freeze, macaroni cheese. Making sure you write all the words, as well, up to twenty. How did you get on? Here are all the answers. I want you to check yours against mine. You may want to pause in case you got some of them wrong and you can just correct them again. Here we have two, two-digit numbers, 12 and 32. We need to represent these numbers on a place value chart. Now, let's have a go at drawing a place value chart together. So, here I have my place value chart. I've got the number 12 and the number 32. I've got my 10's and my 1's and I've got my 10's and 1's. Now for the number 12, let's start with the number 12 first. How many 10's are in the number 12? I know that there's one 10 in the number 12. How many 1's are there in the number 12? See that there's two 1's. You can pause the video to draw out your 10's and 1's, if you want to. Now, so 12 has one 10 and two 1's. Now, let's look at the number 32. How many 10's are there in the number 32? See for everyone, 32 has three 10's. And how many 1's are in the number 32? Simple, there are two 1's. So here I've got two place value charts. I've got 12 and 32. There's the 10's and 1's for 12, you might have the same as me. And 32. Now, what's the same? And, what's different? Having a look at what's the same and what's different. So, I can hear lots of you talking on what's the same and what's different. Can you tell me? Well, lot's of you saw something that was the same in both the numbers. How about now? What's the same, what's different? So, looking at the 10's and the 1's, What's the same, what's different? It's still the same numbers. You're right. The 10's have changed. One number has one 10 and the other number has three 10's. But the 1's haven't changed. They both have the same amount of 1's in both. Two 1's and two 1's. Same, same, matchy, matchy. And now, we have just compared the number 12 and the number 32 using our place value charts. So, we can look at the 10's because they have a greater value than the 1's. 12 has a smaller value than 32. It only has one 10. So, there's the one 10. And 32 has a greater value than 12 because it has three 10's. Now, here we have some different numbers. We've got the number 35 and 39. I want you to have a look at what is the same and what is different. So, think about what's the same and what is different. You may want to pause the video and tell the person next to you. So, are the 10's the same or are the 1's the same? Or, which ones are different? So, we are comparing the numbers 35 and 39. For the number 35 and 39, when we are comparing them, the 10's are the same. Same, same, matchy, matchy. 35 and 39 both have three 10's. Now, we need to look at the 1's. 39 is greater because it has nine 1's. 35 is smaller, it has five 1's. So 39 is greater, it has nine 1's. And, 35 is smaller because it has five 1's. Now, using all this information, which number has the least value and how do you know? So, you've got 37, 34, 27. So, which number has the least value and how do you know? So, the smallest number. Can you shout it out? That's right, 27 because 27 has two 10's and seven 1's. It has less 10's than 37 and 34. Which about this one? Which number has the greatest value and how do you know? So, 37, 34, and 27. Which number has the greatest value? Do you think you can shout it out? And, how do you know? That's right, 37. Because I know 27 has the least value. Then 37 and 34 have the same amount of 10's, but 37 has more 1's than 34. It has seven 1's and 34 only has four 1's. So, 37 has the greatest value. Now, if we were to put these numbers in order from the least value to the greatest value, which one should go first? So, which one has the least value? Which one goes first? Can you shout it out? Great work, so I'll go from 27, then 34, and then finally, the greatest value is 37. So, in order from the least value to the greatest value is 27, then 34, then 37. Good job, everyone! I think you're ready for today's independent task. For your independent task today, I want you to order the numbers from the least value to the greatest value. So, the first one we have the numbers 23, 21, and 31. Then, the next one, we've got the numbers 17, 27, and 37. And then finally, we have the numbers 31, 27, and 26. So, order the numbers from the least to the greatest value. You may want to use a number square to 50 to help you. I want you to pause the video to complete your task and then resume once you have finished. Here are the answers in order from the least value to the greatest value. We have 21, 23, and 31. And the next question, we've got 17, 27, 37. Then, we have 26, 27, 31. How did you do? If you would like to share your work, please ask your parent or carer to share your work on Twitter, tagging @OakNational and #LearnwithOak. And that's the end of the lesson already. Bye!

Lesson overview:Comparing and ordering numbers within 50 (Part 1)

Core Content

Numbers to 50: