How many different abacuses do you think Dr. Cotter has? Here’s a clue…. Dr. Cotter is holding one of her first abacuses: a Japanese abacus, purchased by a friend who […]

RightStart Math

23.10.2025

Quilting and the Cotter Abacus - RightStart™ Mathematics by Activities for Learning, Inc.

I am a quilt designer. I’ve made over 250 quilts in my lifetime, 98% of my own design. I’m currently working on my fourth quilt from someone else’s pattern. I […]

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Start Math Right – Division Chapter - RightStart™ Mathematics by Activities for Learning, Inc.

Start Math Right – Fractions Chapter - RightStart™ Mathematics by Activities for Learning, Inc.

Dr. Cotter's Abacuses - RightStart™ Mathematics by Activities for Learning, Inc.

Quilting and the Cotter Abacus - RightStart™ Mathematics by Activities for Learning, Inc.

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