Estimate, Then Measure

Guess a length first, then check.

Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.

What children learn in Level 41

Before you measure, make a smart guess. That's called an estimate. Use something you know, like the size of an inch tile.
How long is this toothbrush? Picture the inch tile again and again along it. I think about 7 tiles fit. My estimate is 7 inches.
Now measure to check: it's 7 inches! Our estimate was right on.
Estimates don't have to be exact, just close. A real bed is about 6 feet long, not 6 inches and not 6 yards!

Georgia's K-12 Mathematics Standards:

2.MDR.5.2 — Estimate and measure the length of an object or distance to the nearest whole unit using appropriate units and standard measuring tools.