Place value is a big deal when it comes to explaining math concepts. And I especially love to illustrate new concepts with manipulatives. So why not make some shamrock place value manipulatives, right?
There are so so so many ways to use these. We have a tendency to pull out manipulatives anytime we start to have trouble with a concept. Or even just to really cement the idea.
I printed out a few sheets so I had about 6 hundreds, 20 tens, and a ton of ones. I didn’t even cut out all the ones and we had plenty. I changed the printable so that you can print extra hundreds without having to print more tens and ones.
I also added the number cards from the make 10 game to the printable to make it easy to grab them.
I made a pile of the number cards and we just picked at random to make numbers. Then we would match the place value manipulatives to the number we produced.
Some simple subtraction. I had them just take away what they needed to.
Next we would move to subtraction with rollover. I had them break up a 100 into 10 tens. This really helped Baloo when he was practicing mental math. To see why we had to take away one 100 really helped him.
Finally, Baloo and I have been worked on different mental math subtraction strategies. One was subtracting by 97, 98, or 99. Basically you add whatever to get to 100 (so 99+1=100. You’d add a 1) and then take away a 100. He could do the mental sutraction before, but when we sad down and saw what was actually happening he totally understood what was going on. So when I switched it up to 358-199 he was able to easily apply the same technique.