In this Math Is Visual video animation and visual prompts, we will explore integer division through quotative division and partitive division! In particular, we will explore a negative divided by a negative conceptually through concrete and visual representations!

After the previous post on visualizing whole number quotative and partitive division, we are now ready to start tackling integer division. If you have not yet viewed the visual animation and visual prompts for whole number division, you definitely should before moving on.

The next three posts will focus on integer division to finish off the integer operation series. In this video, we will address the division of a negative dividend by a negative divisor first using quotative (or measured) division, then partitive (or fair share) division. The viewer will also be prompted to pause the video and try one their own using concrete manipualtives and/or visuals.

See the instructional guide below aimed to help teachers and/or parents use this activity with their own students/children.

 

Visual Prompt #1: Quotative Division

In the video above, we start with dividing a negative by a negative through quotative division:

-8 ÷ (-2) = ___

in words:

-8 divided into groups of -2 gives a result of ___ groups

 

So, let’s have the viewer model concretely and/or visually the following:

Integer Division - Negative Divided By a Negative -8 divided into groups of -2 prompt

 

Students may use spatial reasoning to create groups of a set or linearly on a number line. They may also consider using repeated subtraction to repeatedly take away groups of -2 until all are removed (or 0 remain).

 

Integer Division - Negative Divided By a Negative -8 divided into groups of -2 solution

 

The arrow can also be pointing to the left if students use repeated addition to repeatedly add groups of -2 from 0 until they reach -8.

Visual Prompt #2: Partitive Division

Now we move on to approaching the same problem from a partitive division perspective:

-8 ÷ (-2) = ____

or

-8 divided into -2 groups gives a result of ____ per group.

 

Integer Division - Negative Divided By a Negative -8 divided into -2 groups partitive prompt

 

Although the value of the result will be the same, the conceptual understanding and concrete/visual approach will look very different.

Similar to above, we can approach this using a set or linear model where we are spatially splitting the quantity into 2 equal, but “negatively charged” groups (since it is -2 groups) and counting the number of objects in each group. While the visual below may look awfully similar, note that the use of repeated subtraction might be a bit different because we do not know how many are in each group (yet). So, the repeated subtraction may consist of fair sharing 1 object at a time or 2 objects at a time, up to a quantity that a student is comfortable to subitize quickly for sharing out.

 

Integer Division - Negative Divided By a Negative -8 divided into -2 groups partitive prompt solution

 

Since we are dividing the -8 into 2 negatively charged groups (groups of -2), then when we put each negative square into the negative group, we get a double-negative. This is very similar to when we use a double-negative in the English language. For example, if it is not going to not rain, then we get the positive – it’s going to rain!

In this case, the negatively charged group “negates” the negative values and thus we get positive values within the negatively charged group.

 

Visual Prompt #3: Your Turn!

Pause the video and let the viewer apply their knowledge of negative by a negative partitive division using the following visual prompt:

-10 ÷ (-5) = ___

or

-10 divided into -5 groups gives a result of ___ per group

 

Integer Division - Negative Divided By a Negative -10 divided into -5 groups quotative your turn prompt

 

Allow time for the viewer to engage in the partitive division before showing the remainder of the video animation or the following still image.

Again, we must note that we want to determine the value of the quantity that will be shared amongst 5 negatively charged groups.

Integer Division - Negative Divided By a Negative -10 divided into -5 groups quotative negatively charged groups

 

Thus, when we fair share the -10 into these 5 negatively charged groups (-5 groups), we will end up with +2 in each group:

 

Integer Division - Negative Divided By a Negative -10 divided into -5 groups quotative your turn prompt solution


So, now you’re rocking with quotative and partitive division as well as division of a negative by a negative.

Are you ready to tackle dividing a negative by a positive and a positive by a negative?

They’re coming up in the next two posts, so get ready for them!

Math IS Visual. Let’s teach it that way.

 

kylepearce3

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