### Hands-on Addition and Subtraction Practice with the Free App Pic Collage

Over the past few weeks we’ve been working hard on mastering our addition and subtraction strategies.  The free app Pic Collage has allowed my students to explain their thinking as well as give them hands-on practice with the strategies we’ve been learning.

When learning about the commutative property of addition, my second graders took pictures of Unifix cubes to prove that you get the same sum no matter the order of the addends.
Of course I also couldn’t resist the adorable flip flop “stickers” that Pic Collage has in their free collection.  I had my kiddos choose their own flip flop number sentences to type on the flip flops.

Comparison subtraction can be a tricky concept so I introduced it with Unifix cubes to give my students a good visual.  They created their own number comparisons with Unifix cubes, and I had them not only write the subtraction number sentence, but also write a comparison sentence in words.

I created some task cards for finding the difference and taped them around the room to get my kiddos up and moving.  I like using QR codes on my task cards so my students can get immediate feedback while I’m busy meeting with my guided groups.

Update: I now have a digital version of these task cards for Google Classroom, which you can check out HERE.
Want more app recommendations? Click on any of the images below to check out dozens of apps reviewed by yours truly.:)

### New Place Value Freebie Plus Some Oldies But Goodies

When I first announced my move back to primary, I promised not to neglect my upper elementary friends.. and since I know most fourth grade teachers spend a good chunk of August and September on place value, I figured I would whip up a fun expanded number form freebie for you.

This jungle-themed puzzle match-up activity is available in two versions—one with QR codes and one without.  For the QR code version, students scan the code to reveal a number in expanded form.  They then match it with its corresponding standard form.  For the non-QR code version, students simply match the expanded and standard form pieces together.

Last year, we used this interactive notebook freebie to practice reading and writing multi-digit whole numbers in word form.
It comes with a full page of QR codes that link to a wonderful Learn Zillion video that explains this concept.  My kiddos glued the QR code into their math journals so they could practice at home.

I also have this freebie for practicing reading large numbers out loud into Garage Band (or any other type of recording device you may have.)  I blogged about this activity in depth here.

Here’s a rounding I Spy activity that my fourth graders loved last year.  I hung the sunglasses up around the room and they solved the problems and then checked their work by scanning the QR codes.

Since most of you will probably dive right into multi-digit addition, subtraction, multiplication and long division, don’t miss out on this Rockin’ Out with Mixed Operations freebie.

I hope some of these freebies can help you tackle the NBT standards in a fun way.:)