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Comparing Addition Sentences
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In this video, we will learn how to compare addition sentences with sums up to 10 by modeling and comparing the parts.
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We can use the symbols less than, equal to, and greater than to compare numbers.
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Six is less than eight.
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Three is equal to three.
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Nine is greater than four.
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We can also use these symbols to help us compare addition sentences.
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For example, one plus two is less than two plus two.
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One counter and two more counters makes three altogether.
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Two plus two is four.
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So, we can say that one plus two is less than two plus two.
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We can tell that one plus two is less than two plus two without even adding.
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These parts both contain two counters.
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This part has one counter, but this part has two.
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One is less than two.
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So, we know that one plus two is less than two plus two.
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Let’s practice comparing addition sentences.
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We can compare numbers and sums.
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Which is greater, seven or six?
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We’re shown two different part-whole models.
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The first shows the number seven, and the second shows the number six.
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We have to work out which is greater, seven or six?
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Let’s compare the parts.
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The first part, which makes seven, contains two bricks.
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How many parts are in the second part?
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Let’s count.
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One, two, three, four, five.
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Two plus five makes seven.
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Let’s look at the parts which make the number six.
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This part contains two bricks.
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It’s the same as this part, which also has two bricks.
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One of the parts which make seven plus one of the parts which make six are the same.
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Let’s count the bricks in the second part to make six.
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One, two, three, four.
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Four and two make six.
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Both numbers are made using a part containing two blocks: two plus five and two plus four.
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Five is one more than four.
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Five is greater than four.
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So, we know that this part is worth more than this part.
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The number which is greater is number seven.
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Seven is greater than six.
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Which is greater, two plus five or four plus two?
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We know that five is greater than four and two is equal to two.
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Because five is greater than four, we can say that two plus five is greater than four plus two.
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We didn’t need to add.
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We just needed to compare the size of the parts.
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Two plus five is greater than four plus two.
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Pick the correct symbol to compare the sums.
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Three plus two is equal to, less than, or greater than one plus four.
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Hint: Make models and think about the sums.
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Three and two is what?
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One and four is what?
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We have to compare two sums or two addition sentences, three plus two and one plus four.
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We have to pick the correct symbol to compare them.
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It could be equal to, less than, or greater than.
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We’re given a hint.
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We’re told to make models and think about the sums.
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Our first part-whole model shows two parts, three and two.
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This model shows the sum three plus two, but we don’t know the total.
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Let’s use a model to help us find the total.
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Let’s use a five frame and some counters.
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Three and two make five, and one plus four also makes five.
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Both sums equal five.
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So, the correct symbol is equal to.
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Three plus two is equal to one plus four.
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Both sums give us a total of five.
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So, the correct symbol to compare the sums is the equal to symbol.
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What have we learned in this video?
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We found two ways to compare addition sentences.
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We could compare the parts or find the total using models.