Building Number Sense on a 100 Chart

Yes, yes, yes, it has been a while since my last blog post. I'd like to not have so much time in between them but life kind of gets in the way of that!! :)

I am here today to bring you a number sense game that I use as a daily warm-up, but can also be used as a whole group, small group or math center/station activity.

Building number sense is something that all grade levels should must have to, have to can do. ;) It is especially important for K-2 to build number sense in order to lay the foundation for higher level math. (Not to mention that number sense is needed to do everyday activities such as cooking, games and playing sports!)

One tool you can use to help build number sense is the 100 chart:

The activity I want to share is called "Arrow Arithmetic" in It Makes Sense! Using the Hundreds Chart to Build Number Sense (click below to view the book).

In this activity, students will receive a clue such as:

and will use the 100 chart to figure out the answer. So how do they figure out the missing number??? They have to use the arrows and some number sense! 

Each arrow represents a direction you can go on the 100 chart: left (-1), right (+1), down (+10) and up (-10). Students can use a 100 chart to determine that the missing number is 45. Eventually, students will be able to determine the answer using mental math and even be able to solve problems that include diagonal arrows. And what does that eventually lead to?? Being able to add and subtract two-digit numbers using mental math!

Pretty cool, huh?!

I urge you to give this activity a try. My students LOVE it and beg to play it every day (which lately, we have been doing)! And they are REALLY good at it. :)

I made a little activity pack to go with the Arrow Game activity from the book:

The pack includes two sets of arrow cards, 1 easy and 1 challenging. Also, allow students to self-check with QR codes:

I have also included a few practice pages:

It's even on sale for SuperBowl Sunday!

Check out the activity here:

P.S. Need some 100 charts for your class? I've got a set for your FOR FREE! Click below!

My Math Block Mini-Series {Part 5}

Welcome to part 5 of this series! If you missed any of the posts in this series, click below to go back:

My Math Block Mini-Series {Part 1}

My Math Block Mini-Series {Part 2}
My Math Block Mini-Series {Part 3}

My Math Block Mini-Series {Part 4}

7. Build the hundreds chart

This is something we started just a few weeks ago. I put up the blank chart and told them that all of the numbers fell off and we need to rebuild it (challenge accepted).

Please ignore the orange thing for now. :)

I have been pulling seemingly random numbers each day for the kids to put on (seemingly because there is a purpose behind each number that I pull). The first few days, I used multiples of 5 and numbers that go one under the other. The kids quickly caught on and knew exactly where the numbers go. The usual routine is I pass out 3-4 numbers to random (good listening) students. One at a time, they stand up at the front and show us the number (I will call on low students last to give them extended time to figure out where the number goes). The other students will look on the chart and eyeball where they think it goes. After 30 seconds to 1 minute, the student with the number places it where he/she thinks it goes and tells why. The other students give up a thumbs up or down if they agree/disagree. Sometimes, I call on multiple students to tell where it goes instead of the helper. That is totally random. After each number is placed, we always discuss patterns and make some predictions. In the few weeks that we have been doing this my students' knowledge of the hundreds chart and numbers in general has skyrocketed! I am very pleased and impressed!

We use the orange window to focus on a number and determine what is 1 more and 1 less. I made it really quickly one day because I forgot to make it ahead of time; it is just laminated cardstock with popsicle sticks taped on the back.

8. Weather

Weather has become a bit more popular since we added a few more things to it. Here is a flashback to September:

And now:

It changed after we studied more about clouds and wind in science. I LOVE to change things up based on new learning and so do the kiddos! One young meteorologist (we always use the proper term) takes the page off the clipboard (which is attached with command strips) and goes outside to check the clouds and the wind; he/she will move the paper clip accordingly. Another meteorologist grabs the "How does it look?" cards and checks the sky. A third meteorologist grabs the "How does it feel?"cards and checks for that.

While the meteorologists are checking, the calendar helper is calling on classmates to make weather predictions. We have recess, P.E. and music right before our math block, so the students recall what it looked/felt like from then. After the meteorologists return and deliver the report, we put all pieces back on the board and read it together.

And that, my friends, ends our calendar time!!! :) It took 5 posts to explain it though our calendar time only 15-20 minutes (longer when they have SO much to say and I hate to turn it off). I'm so glad you stopped by to read about it and I hope you are leaving with some new ideas!

Next up in the series is the remainder of my math block, which is math lesson/stations time. Tune in tomorrow!! :)