Hello there! The value of 7 in the number 21,780 is 700. Here are the place values of all of the numbers:
• 2 has a value of 20,000
• 1 has a value of 1,000
• 7 has a value of 700
• 8 has a value of 80
• 0 has a value of 0
If you need any extra help, let me know and I will gladly assist you.