Free first-grade measurement worksheet: measure objects by counting units, with an answer key.
This first-grade measurement worksheet builds on counting units to measure the length of different objects. Understanding non-standard units is an important step toward using rulers and standard measurement. Includes an answer key.
Click "Download PDF" to save the worksheet, or "Open & Print" to print it directly. Each worksheet includes an answer key on the last page. For interactive practice, try our free Math Practice tool, which includes time, money, and measurement skills.