This unit features 10 bars, each containing 10 beads (100 beads total). Use the Ten-Bar Demonstration Rekenrek to teach numbers up to 100.Great for supporting the development of number sense, rekenreks are visual models that encourage students to subitize, think of numbers in groups, strengthen counting proficiency, develop addition and subtraction strategies, and gain a better understanding of number relationships.You move the beads to the left and read it from left to right. An abacus is cleared with all of the beads to the right (I like to put a sticker or a sharper marker smiley face on the right corner of the abacus to help children know when it is cleared).It sometimes has one solid color per row, or the ones that I prefer have 5 red beads and 5 white beads. My new fan favorite is this awesome demo abacus! It uses large beads and you can do endless math concepts on it (addition, subtraction, multiplication, division, fractions, decomposing and composing, place value, and more).

Basically, this tool has 100 beads on it. It is also known as Ten Bar Rekenrek, 100 Number Rack, and 100 Math Rack. we use the Danish Abacus as it works with our base-ten system (with 100 beads). Guess what? It is the same thing! So let’s get the lingo straight! What is an abacus?

Most of you have heard of an abacus then the other day I saw it called a Ten Bar Demonstration Rekenrek.

In math today, it seems like you finally understand what a new math tool is called and then you hear a new name and wonder if it is the same thing or something completely different.

Abacus counting games