"Let's dig in and measure!" says Bo. Model choosing the right tool and reading a scale carefully, always naming the unit. Read a ruler to show a log is 1 m 35 cm, and convert: 1 m 35 cm = 135 cm.
Then model area by informal units: lay same-size square tiles over a leaf and count them, counting a half-or-more square as one. Stress that the squares must be equal in size, or the count means nothing.
Together 1. Order shortest first: 90 cm, 1 m, 45 cm, 2 m.
Together 2. Bo's 2-litre bucket already holds 750 mL. How much more fits?
Together 3. Count the squares covering a leaf to estimate its area in square units.
Students complete "Measuring with Bo: Length, Mass & Area". The support version focuses on simple conversions and square-counting; the extension version converts between units and solves multi-step measurement problems. Provide rulers, a balance, and square tiles so measuring stays hands-on.