Today's strategy is a little difficult to understand. There are more steps for this strategy and more ways to make errors. Since you have to regroup, it isn't as easy as the break apart method without regrouping. Many students want to subtract using that method and it doesn't work the exact same way.
Let's use 745 - 418 as our example.
Most students will want to break apart both numbers to subtract them. It works until you get down to the ones. The students get stuck when they try to subtract 8 ones from 5 ones.
The solution - only break apart the second number.
Let's use 745 - 418 as our example.
Most students will want to break apart both numbers to subtract them. It works until you get down to the ones. The students get stuck when they try to subtract 8 ones from 5 ones.
The solution - only break apart the second number.
After you break apart the second number into its hundreds, tens, and ones, you take the first number and subtract the hundreds. This is shown below in green.
Then you take that difference and subtract the tens as shown below in blue.
The last step is to take the new difference and subtract the ones. This is shown in purple below.
There aren't any video resources that I've found for this strategy.
As always...
If you have any questions about your specific student, please email me.
If your question is a general one about this post, feel free to leave a comment. Comments are moderated.
If you want to submit questions for future posts, you can email me or just fill out the contact form on this site.
As always...
If you have any questions about your specific student, please email me.
If your question is a general one about this post, feel free to leave a comment. Comments are moderated.
If you want to submit questions for future posts, you can email me or just fill out the contact form on this site.
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