WEBVTT
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Complete the following: 50 plus 20 plus four equals what plus what, which equals what?
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First, we need to calculate 50 plus 20 plus four.
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We can use a place value grid to help us add these three numbers.
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Our first number is 50.
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Then we have to add 20 and four.
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How many ones do we have altogether?
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Zero plus zero plus four equals four.
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How many tens do we have altogether?
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Five tens plus two tens makes a total of seven tens.
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50 plus 20 plus four equals 74.
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The next part of our question asks us which two numbers we can add together to total 74, or which two numbers are equal to 50 plus 20 plus four.
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We could partition 74 into its tens and ones.
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We know that 74 has four ones and seven tens, which is worth 70.
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So 50 plus 20 plus four is equal to 70 plus four.
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And we know that 70 plus four equals 74.
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The missing numbers in the equation are 70, four, and 74.
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50 plus 20 plus four is equal to 70 plus four, which equals 74.
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We used a place value grid to help us add the first three numbers in columns.
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Then we partitioned the answer to find the three missing numbers.