Video: Adding one

﻿Hello. My name is Mrs. Judith, and I'm going to be taking your lesson today. Let's have a look at the practise activity that you were left at the end of last lesson. Did you use your number bond chart to help you solve it? We're going to use it together now. So, hmm. 10 is made of one and nine, nine and one make 10. So 10 minus one is equal to nine. 10 is made of two and eight, eight and to make 10. So 10 minus eight is equal to two. 10 is made of three and seven, seven and three make 10. So 10 minus three is equal to seven. 10 is made of zero and 10, 10 and zero make 10. So 10 minus zero is equal to 10. Did you notice something about the equations on the other side? I noticed that they use the same numbers. That some of the equations on the other side use the same numbers. Like this one at the bottom. 10 minus mmh is equal to nine. 10 and. 10 is made of one and nine, nine and one make 10. And this one. 10 minus mmh is equal to eight. Yes. 10 is made of two and eight, eight and two make 10. Hmm. Seven. Oh, I've used that as well. 10 is made of three and seven, seven and three make 10. This one I haven't already used these facts so. 10 is made of four and six, six and four make 10. So 10 minus four is equal to six. Then you were asked to represent one of these equations using a bar model. I chose to represent this one. Can you guess the equation? Yeah. It's the one that is 10 minus eight is equal to something. It's equal to two because 10 is made of two and eight, eight and two make 10. In today's lesson we're going to look at something slightly different. We're going to start by counting. But I've got a problem with my number line. Some of the numbers are missing but I know you're really, really good at counting. Can you help me with the missing numbers? Fantastic. So let's start at the beginning. I've got zero, one, two. Hmm. What comes next? Did you say three? That's right because three is one more than two. So I know that's the next number on my line. Should we start again? Zero, one, two, three, four. Oh no I've got another missing number. Did you say five? That's right, because five is one more than four. Lets start again. Zero, one, two, three, four, five, six, seven, eight, nine, 10. Fantastic. We're going to be using our knowledge of this and one more to help us with our learning today. Can you help me to tell a story with the pictures? You might remember this from a previous lesson. Let's have a look at our story. Should we have a go at telling it together? First I had three flowers in my bars. Then I added one more flower. Hmm. How many have I got now? What's the equation that goes with this? Did you say three plus one? Three. Oh three plus one. One more than three is four. So three plus one is equal to four. What about these pictures? How many have I got first of all? Six. Then I've got one more. How many have I got now? What's the equation that goes with this picture? Did you say six plus one? Six plus ... One more than six is seven. Six plus one is equal to seven. What about in this picture? What can we see? Yes. we've got one outside the 10s frame and six in. So if I was to put them together that would be one plus six is ... Oh that's quite tricky. Counting six. But I remember. Can you remember our generalisation from last week about the addends? Can you remember that we can change the order of the addends and the sum remains the same? So I'm going to switch them. I'm going to say six plus one because I know that one than six is seven. So one plus six is equal to seven. Can you have a look at this picture? What can you see? Can you see three footballs and one basketball? How many balls have I got all together? What's the equation that goes with this picture? Have you said three plus one? So I have three footballs and one basketball, three plus one. I know what one more than three is. One more than three is four. So three plus one is equal to four. There are four balls all together. Let's have a look at this picture. You can pause the video and tell somebody what you can see. Can you see one adult cat and seven kittens? What would the equation be if I wanted to know how many cats there were all together? Did you say it's one plus seven because I have one adult cat and seven kittens? Ooh, that looks tricky. I don't want to count on seven. Hmm, but I know that we can change the order of the addends and the sum will remain the same. So instead of doing one plus seven, I'm going to do seven plus one. Because I know that one more than seven is eight. One plus seven is equal to eight and seven plus one is equal to eight. Let's have a look at these together. We're going to try and solve them really quickly because we know that adding one gives one more. Let's have a look at the first one. Oh, it's a number bond to 10 as well. 10 is made of one and nine, nine and one make 10. And I know one more than nine is 10. And the equation opposite it, we've changed the order of the addends but the sum remains the same. One plus nine is equal to 10. Have a go at the next two. Pause the video, try and do them really quickly. Did you have a go? Did you say eight plus one, one more than eight is nine and the equation opposite we've just changed the order of the addends so the sum remains the same. One plus eight is equal to nine. Let's have a look at the next one. Pause the video and have a go. Did you do it really quickly? Super. Seven plus one, one more than seven is eight. And the equation opposite, we changed the order of the addends but the sum remains the same. So one plus seven is also equal to eight. Well done. You've worked really hard on this. I'm going to leave you with this practise activity to have a go at. Remember, we can change the order of the addends and the sum remains the same. On adding one, gives one more. See if you can do them really quickly. Well done for all your hard work today everyone. See you next time.

Lesson summary: Adding one

In this lesson, we learn that adding one gives one more.

Maths

Y1 Maths

Key Stage 1

Year 1

Adding one

Addition and subtraction

UNIT

The commutative Law of Addition using aggregation

The commutative Law of Addition using augmentation

Measures Contexts to Show the Commutative Law of Addition

Embedding Understanding of Equivalent Expressions

Ten can be partitioned into pairs of numbers that sum to ten

Reasoning with number bonds

Numbers that Sum to 10

Subtracting one

Consecutive numbers

Adding two

Subtracting two

Adding and subtracting with 5 and 3 and with 6 and 3

Adding or subtracting Zero

Subtracting a number from itself

Adding one

Video

Lesson summary: Adding one

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