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"We recently sent the call out on our Teacher HELPLINE! for teachers to tell us the best websites for teaching math. And wow, did you all come through! We've gathered all the links and a short description of each math website. The list encompasses grades K-12 and is chock-full of resources, games, freebies, and innovative programs. Not to alarm you, but, we think you're going to want to bookmark it. STAT! Without further ado, here it is:"

We teach children about numbers, but how do people come to know what numbers are, given that they are abstract? There must be some process of learning that takes place. This paper explores this problem, offers several alternative accounts of what a number is, and argues that the concept of a number can be learned by learning to recognize the size of a set or collection of entities. Teachers call this subetizing

"Close your eyes and picture the most recent math class you taught. Who is doing the math? Who is doing the talking? Who is doing the thinking? Three years ago, my answer would have been "me"-the teacher. My students were doing math, but I was probably telling them how to think and what to do most of the time. My big aha moment was being introduced to the research of Peter Liljedahl, a professor at Simon Fraser University. Liljedahl proposes three strategies that you can implement in order to create what he calls the thinking classroom: Start with good problems, use visibly random groups, and work regularly on vertical nonpermanent surfaces. I started using these three strategies in my math classes, and they have been an absolute game-changer. I can confidently say that my students now do most of the thinking and talking in my classroom."

"Nighttime Numeracy: Sending out math prompts for you and your child to discuss before bed."

"Resources and activity ideas for kids to learn computer programming and coding - learning tools, programs, apps, websites, books, online and offline courses, and teaching / learning activities for kids from preschool kindergarten to middle and high school"

"These talks are here to set the record straight and illuminate the unexpected ways formulas and fractions influence everything, from love and war to origami and coral reefs."

"Helping children visualize math is critical to their success in the subject. I recently observed a 5th grade class starting a lesson on area and perimeter. I turned to a girl who was in my class four years earlier and reminded her that she knew the topic. "Yes I do!" she said excitedly. "The perimeter is where you sit along the outside of the rug in morning meeting, and area is the inside of the rug, where the squares are. That's from 1st grade," she said confidently, circling her fingers in the air to represent her thinking. Visual cues, like this one I use with my six- and seven-year-old students, stick and show that envisioning math helps children learn in lasting ways. We teachers can do more to give students internal ways to see the structure of mathematics-to understand types of units and what it means to move between them, and to pull apart and combine numbers. But math instruction is changing. At my school, in the early grades, we encourage children to use their fingers, something that feels so natural to them, to better understand numbers and the numbering system. We might talk about how a "high five" involves using a whole hand, which is really a unit made up of five fingers; while a thumbs-up involves just one segment of that five-part unit. We then go on to using things like beads on a string and, later, place-value disks, which are like poker chips, to help children see and work with numbers, units, and place value."

"Today we spent sometime going through iTunes App Store collections for high school students and curated for you the apps below. These are some good applications high school students can use to help them with their math. The apps are arranged into three main categories: Algebra, Geometry and graphing and calculation apps.  We invite you to check them out and share with your students. The visual below is also available for free download in PDF format from "

"Using simple images, the Splat! lessons teach a range of math concepts at different levels of difficulty. Download free 50 lessons. "

"Below you will find 56 of the best math resource websites available. Parents and teachers of children 3 to 23 who are looking for videos, games, worksheets, printables, lessons, tutorials, calculators, worksheet generators, activities or interactives will likely find what they are looking for. "

"Imagine a parent telling a child, "I'm just not a reading person." Sounds odd, doesn't it? Now reread the same cartoon, substituting "math" for "reading." Suddenly it doesn't seem so absurd. But it should! As a society ever more reliant on technology and STEM-based careers, we must shatter the myth that math skill is inborn and reinforce that it is the result of intention and practice. It's common to hear well educated adults declare themselves "not a math person," sometimes proudly. Indeed, many people of all ages believe that mathematical ability is something you are either born with or not, rather than something to be mastered with focused effort. This belief is wrong. What's more, it's harmful to kids as they have their first experiences learning math; the attitude that "I can't learn math" quickly becomes a self-fulfilling prophecy. As a society ever more reliant on technology and STEM-based careers, we must shatter the myth that math skill is inborn and reinforce that it is the result of intention and practice. Reforming these perceptions needs to be a priority for teachers, parents, and creators of new learning tools that align to the way these digital-savvy students learn."

"Games can be a great tool for teaching students about complex topics like digital citizenship, politics and even science. With about 47 percent of kids aged 4 to 13 playing digital games every day, game-based learning is poised to further engage children in the classroom. One classroom in Tampa, Fla., has discovered that digital games can help some children with mathematics. Gregory Smith, a fifth-grade teacher in Hillsborough County, tells Education Week that after incorporating math-strategy games - think word problems with corresponding interactive elements - his students' math-skills scores went from an average of 49 percent to 83 percent. The students themselves also reported more enjoyment from math."

"Mathematicians Hannah Fry and Thomas Oléron Evans have crunched the numbers. Forget utilities - these are the properties you really should be investing in."

"Mathematics is a fundamentally logical and beautiful subject, but one that universally invokes a sense of anxiety and fear in students and adults. However, mathematics is in everything around us and it is more than just a subject, it is an essential life skill."

"Many people find mathematics daunting. If true, this piece is for you. If not, this piece is still for you. What do you think of when you think about mathematics? Perhaps you think about x's and y's, intractable fractions, or nonsensical word problems. The cartoonist Gary Larson once depicted hell's library as containing only giant tomes of word problems. You know, "If a train leaves New York…" I was trained as a mathematician, and I will let you in on a trade secret: That is not what mathematics is, nor where it lives. It's true that learning mathematics often involves solving problems, but it should focus on the joy of solving puzzles, rather than memorizing rules. I invite you to see yourself as a problem solver and mathematician. And I'd like to introduce you to the man who once invited me to the study of problem solving: George Pólya."

"Over more than a decade, the author has developed a 14-point plan for encouraging students to engage deeply with math content."