4th Grade Math 2.11, Multiply 3 or 4 digit Numbers by 1 digit with Regrouping

We can use regrouping to multiply a 1-digit factor by a factor with many digits. We start on the right side with the ones place, then the tens, then the hundreds, then thousands. We regroup when the product in any place is 10 or more. We write the regrouped number in the column above the next greater place. We then multiply to that column, and add the regrouped amount to that partial product. Turning a sheet of lined paper sideways will help us keep our place value straight. Before we multiply, we can estimate the product to know what a reasonable product should be. If we round our factor to the next digit to the left, our estimate will be more accurate. We can tell how many digits will be in the product from an estimate. We solve a multi-step word problem involving a table of information. We solve and compare to find less than, greater than, or equal to. We solve a word problem involving 4-digit numbers multiplied to a 1-digit number with subtraction. We find what number is a given amount more than the product of two given factors.

4th Grade Math 2.4, Estimate Products by Rounding
   • 4th Grade Math 2.4, Estimate Products...  

4th Grade Math 2.10, Multiply 2-digit Numbers by 1-digit Numbers with Regrouping
   • 4th Grade Math 2.10, Multiply 2-digit...  

4th Grade Math Playlist (2015)
   • 4th Grade Math Course  

I'm using the Houghton Mifflin Go Math!
2015 copyright textbook for this playlist.

You can practice online using the textbook's website
https://www.gomathacademy.com/

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