Before preschoolers are ready for centimeters and inches, they're perfectly ready to measure with blocks, shoes, handspans, and paper clips. Non-standard measurement — using any consistent unit to measure something — is the conceptual foundation that makes standard measurement meaningful later. When a child measures the table as "12 blocks long" and the book as "4 blocks long," they're building genuine measurement understanding: longer objects need more units, shorter objects need fewer. It's the same insight a ruler provides, without the abstraction.
Getting Started: Unit Block Measuring
- Choose a unit: Start with standard wooden unit blocks (all the same size) for consistent results. Alternatively use: Duplo bricks (snap them end-to-end), craft sticks, crayons, or shoes.
- Choose what to measure: A table, a book, a toy car, a child's arm, the distance from the door to the window.
- Lay units end-to-end without gaps (this is the key technique — gaps make measurement inaccurate).
- Count the units and record the result. "The table is 14 blocks long."
- Compare: "The table is longer than the bookshelf — 14 blocks vs. 10 blocks."
Measurement Activities
Height Chart
Have each child lie on the floor. Measure how many blocks tall each child is. Record on a chart and compare. Who is tallest? How many blocks difference?
Estimate First
Before measuring, ask "how many blocks do you think it will take?" Record the estimate, then measure and compare. This builds estimation skills and mathematical reasoning.
Toy Comparison
Measure 5–6 different toys. Put them in order from longest to shortest without measuring first, then verify with blocks. Does the order match?
Build to a Measurement
"Build a tower exactly 8 blocks tall." Children build while counting — early precision measurement.
Area Introduction
How many blocks does it take to cover a book? A placemat? This introduces area — measuring in two dimensions rather than one.
Frequently Asked Questions
What measuring concepts are appropriate for preschoolers?
Preschoolers (ages 3–5) are ready for: length comparison (longer/shorter), height comparison (taller/shorter), weight comparison (heavier/lighter using a balance scale), and non-standard measurement. Standard measurement (centimeters, inches, pounds, kilograms) is introduced in kindergarten and first grade, but only makes sense if children have the underlying concepts first. Rushing to standard units before the conceptual foundation is in place creates confusion rather than understanding.
Why is it important to use consistent units when measuring?
If you mix large and small blocks, the count doesn't tell you anything meaningful — a longer object might have a smaller number if measured with large blocks than a shorter object measured with small blocks. This inconsistency is why standard units (the centimeter, the inch) were invented — so measurements could be compared and communicated across different people and places. Help children discover this problem by intentionally mixing block sizes and observing the confusing results.
Related math activities: Counting Nature Objects | Shape Scavenger Hunt | Sorting Activities
