Tap the button. Click on the tool to begin. Write the largest 4 digit number you can using the digits 6, 7, 8, 9. Tap the button to write the number in expanded form. Tap the button to explain how you know that your number is the largest four digit number. Add a to your completed work. Tap the to explain the value of each place value. Tap the in the upper right hand corner to add to your journal.