The Distributive Property states that multiplying a sum by a number is the same as multiplying each addend by that number, and then adding the products. We can use the Distributive Property to multiply a 2-digit number by a 1-digit number. We can break apart the greater number as a sum of two lesser numbers. Next, we multiply each of the two lesser numbers by the 1-digit factor. Then we can add those partial products to find the total product. We’ll get the same answer no matter how we break apart the 2-digit number. We multiply a 1-digit number by a 2-digit number by using grid paper. We multiply 1-digit number by a 2-digit number by using base ten blocks. We see how we can use mental math to solve multiplication problems that involve a 1-digit and 2-digit number. We write a word problem that fits a picture, write an equation, then solve. We see why it’s helpful to use parentheses when writing or solving an equation with more than one operation.
4th Grade Math Playlist (2015)
I’m using the Houghton Mifflin Go Math!
2015 copyright textbook for this playlist.
You can practice online using the textbook’s website
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