Pick a long classroom object to measure the length using erasers. Then take a photo of the object and the erasers and explain how long your object is. Remember to say the units you are using. "My pencil is 6 rainbow erasers long." 1. Tap the add button. 2. Tap the check to add to your journal. 3. Tap the sign. 4. Tap the button and take a picture of your measurement. 5. Tap the tool to show how you counted the erasers. 6. Tap the tool and type how many erasers you used. 7. Tap the and explain how you measured your object. 8. Tap the to save your work.