Book 3 of the Linear Abacus® Pocket Book Series
Can they tell you why the formula for volume of prisms is length × width × height — or have they just memorised three letters to multiply together?
One bead. Three questions. How far does it reach? How much does it cover? How much does it fill? The same bead is a length, a surface, and a solid — so the same string that counted to a thousand can now measure a step, cover a table, and fill a box.
What the book does
No new tool required. This is the beauty of the Linear Abacus® — the same bead your child has already used to build numbers and measure length now answers two more questions, because one bead is one thing seen three ways: an edge, a face, and a whole.
Measuring the World takes your child from walking a shape’s perimeter, to covering a surface, to filling a space — and shows them these were never three separate topics. They are one idea, seen three ways. Your child doesn’t need to remember that area is length times width, or that volume is length times width times height. They will feel it in their hands and see it with their eyes first — so when the formulas do arrive, your child already understands what they describe.
Compact, not thin. These are not one-off tasks — each activity can be lived in across a week, then returned to later with new eyes and new questions. Your child measures a real shelf, covers a real table, fills a real container — and finds that mathematics was never abstract. It was always measured in the world around them. Because these ideas are built with their own hands and felt in their own body, they don’t fade the way a memorised formula does. An embodied understanding lasts a lifetime.
Who this is for
Children in grades 3–8. Parents who want to sit alongside their child and follow the questions together — the book gives you the words to say and the moves to make.
This book uses the same Linear Abacus® your child already has from Books 1 and 2 — no new equipment needed. If you don’t yet own one, the Master Place Value hang pack bundle includes both a book and a 100-bead Linear Abacus® in one box. Schools who already have class sets of the Linear Abacus® can order additional copies of the book here for new classes or replacement copies.
