You are watching: How can you use an array to show the commutative property
This selection has 4 rows and also 3 columns. It can also be described as a 4 through 3 array. Words "by" is regularly represented v a multiplication cross: 4 × 3.
Notice that the rows in each array are equal in length. Think the the rows together equal groups. Your students should have already used equal groups to main point (2.OA.C.4).
When you present students the connection in between equal groups and arrays, students can visualize how to use arrays come multiply. Lock will use arrays again later on to divide.
Look in ~ the multiplication sentence that explains the range below. The numbers in multiplication sentences have special names.
The number that space multiplied are dubbed factors. The result of multiplying the components is referred to as the product.
Now look at what wake up to the factors and also product in the multiplication sentence once the variety is rotate on that side.
The bespeak of the factors changed, but the product stayed the same. This is in fact constantly the case and a attribute that has actually piqued the attention of mathematicians for centuries. You can change the stimulate of factors, yet the product continues to be the same, a mathematical property recognized as the Commutative building of Multiplication. Students need to be acquainted with the commutative property because they have already seen it used to enhancement (1.OA.B.3).
Help student realize the by applying the commutative property, they understand twice as numerous multiplication facts. Because that example, if they recognize 8 × 5 = 40, then they likewise know 5 × 8 = 40.
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