Are you flummoxed by students who know the addition doubles facts with automaticity but, for whatever reason, haven’t transferred that knowledge to the subtraction doubles? Here’s a free activity to help them make that connection.
What Do My Students Need to Know to Master the Subtraction Doubles Facts?
There are two prerequisites for mastering the subtraction doubles facts. First, students need to be fluent with the addition doubles facts. Secondly, they need to understand the inverse relationship between addition and subtraction.
As we all know, most students find learning subtraction facts more difficult than addition. The strategy for learning the subtraction doubles facts is to “think addition”. So, what’s the problem?
While pondering this, it struck me that the dilemma is these students simply don’t recognize the subtraction doubles facts for what they are.
How Can I Help My Students Use Doubles to Subtract?
One way to develop this recognition is more work with the parts and the whole. These kiddos easily recognize the parts and then recall the whole for addition. Why not work on deriving the parts from the whole?
Popping Doubles for Subtraction is a free resource for first and second-grade math. It is for students who’ve mastered the prerequisites but aren’t making the connection. The focus is on matching the parts to the whole to increase familiarity with the subtraction doubles facts. Use it during small group instruction or as an independent math center.
There are two versions, each in color and black/ white. Students match the whole and the parts for each double and place them on a popcorn mat, for the first open-ended version. The whole is given and students match the parts in the second version.
How to Prepare Popping Doubles for Subtraction
- Choose to print in color or black/ white.
- Pick the mat that is open-ended or the ones with the whole given.
- For the open-ended mat, decide if you want your students to use one mat (place the matches, record, and clear) or multiple mats.
- Print the mats and the popcorn numbers (parts). Use card stock and laminate for durability. Cut each page of mats in half. Cut the popcorn numbers around the outlines or as rectangles.
- For the open-ended mats, print the bucket number ovals (wholes). Cut as ovals.
- Print copies of the recording sheet, if using.
Popping Doubles for Subtraction is a simple matching activity! Give your students the mats and the numbers. Tell them to find the parts that match the whole to create subtraction doubles facts. Have them record the corresponding equations. They can write these on plain paper, whiteboards, or the optional recording sheet. The recording sheet has spaces to write both the addition doubles equation and the related subtraction one.
Add a little fun! Use a popcorn box or bag to store the number cards. Go ahead and pop some popcorn, too!
Click on the highlighted words, Popping Doubles for Subtraction, to download this free activity. Comment below on how you help your students make connections between addition and subtraction.
This content was originally posted at Just Ask Judy.
Popcorn Photo by etorres69