2.03 Subtraction without regrouping
Are you ready?
Do you remember how to solve addition problems, using some different methods?
Use the number line, to help you find the value of $23+354$23+354.
$23+354$23+354 $=$= $\editable{}$
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Another word that we can use to describe the ones place is 'units'.
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You might notice that sometimes the standard algorithm is called the 'vertical algorithm'. Let's think about why. When we use the standard algorithm, we line our numbers up in 'vertical' place value columns.
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Just like addition, we can use place value blocks (also called base $10$10 models) to solve addition. See how we do this in this video.
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We can also use place value columns to solve subtraction problems working down our page. In this video we look at subtracting a number in the thousands from another number in the thousands.
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Question 2
Use the number line to find the answer to $379-329$379−329.
First place $379$379 on the number line.
Place $329$329 on the number line.
Use the number line to work out the difference between $379$379 and $329$329.
When we are subtracting down the page, it's really important to start from the right (ones place) and work to the left, no matter how many digits our numbers have.
