I like math now. I used to think I didn’t like it very much.
Since I’ve been teaching little (and big) people about math, I have come to
love it like it.
2-Digit Subtraction with Regrouping
Last week, the 2nd graders and I explored 2-digit subtraction with regrouping. I had held off on this with my 2nd graders, because they haven’t achieved mastery of their addition or subtraction math facts within 20. They do know how to find the answer if they don’t know it right away, but I wanted them to be able to say the answer within seconds on every fact. It just wasn’t happening, though with time and tools (fingers, thinking, abacus, number line, etc.) they could find the correct answer.
But I realized they were beginning to dread math and … perhaps, hate it. I knew I had to make some changes. I
searched within my inner teacher remembered some wise advice from a seasoned homeschool Mom who had advised me several years ago to not hold them back in math while waiting on mastery.
So we forged ahead and used a pinterest post to work on 2-digit subtraction with regrouping. They seriously grasped it within MINUTES of me explaining it. They have a solid understanding of hundreds, tens, and ones, so they grabbed onto the idea of using some of the tens to add to the ones.
After a couple of examples, I gave them each several problems to work with the LE*GO bricks. They did well.
I then gave them some to work on paper without the LE*GO manipulatives at their prompting. They aced them.
I wanted to give them this intro into 2-digit subtraction with regrouping and to record what they had learned as well, so I had them gather their math notebooks and some markers.
We used another pinterest pin to put a new page in their interactive notebooks. I encouraged them to use color to make their own entry in their notebooks, and they did so well!
After continuing to explore this concept and work out problems, I am confident they understand the concept. Now we will just work on gaining more ease and comfort as well as continuing to work on those math facts within 20, which brings me to the next set of photos.
Math Facts Within 20 Mastery
You might see in the above photo some finger counting going on … sigh. I guess on the positive side, he knows HOW to find the answer. I just am hoping by summer, they just KNOW the answer.
In a quest to continue mastering those math facts in a way that isn’t drill and kill or one and done, I have been creating a series of games and task cards with different themes. This is the latest one I’ve created with a snow theme, and they like to play it a few times a week.
After noticing the finger figuring above, I decided to pull out their notebooks and turn to the Hundreds Charts I made a couple of years ago. I encouraged them to use the chart instead of their fingers, and they made use of it I’m happy to say!
With Snow Day Take Away, I’m able to choose from one of three game boards (color AND black-and-white options) to use with the 50 task cards, which all have subtraction problems within 20. Each of the game boards differentiate with the first one giving just a number on the spaces. The second one gives the answer as an addition problem using doubles addition, a number + 0 and a number + 1. Finally, the third and hardest game board uses addition problems on the game board, but they are varying such as 7 + 6, which would match with 20 – 13 on the card or 8 + 5, which would match a card showing 19 – 6.
With each game board, the student goes to the space that has the same answer as the problem on the task card they’ve drawn.
I have also included optional play suggestions as well as a set of recording sheets for use with the cards as well for independent work.
I laminated the recording sheets (but you could use page protectors as well), so that we can reuse them again and again. I have my 2nd graders check their own work with the included answer key.
I don’t know about you, but I find varying methods for learning and mastery work best here.
In addition to these kinds of hands-on activities, my students use my iPad several times a week as well as the laptop and IXL math for math practice problems.
While all of this math learning was going on, a certain Li’l Bit was busy as can be making her very own “starflake” with the pattern blocks.
I think a certain Li’l Bit was really paying attention to our previous lesson on snowflake (or “starflake” as she calls it) symmetry!
A Question For My Readers: What do you find most helpful for mastering math facts besides worksheets, flashcards and drills?