Place Value Exercise: Write 987 as Hundreds + Tens + Units

To construct the number from the given digits, we'll express the number in terms of its place values: hundreds, tens, and units.

• Step 1: The hundreds digit is 9, so its value is $9 \times 100 = 900$.
• Step 2: The tens digit is 8, so its value is $8 \times 10 = 80$.
• Step 3: The units digit is 7, so its value is $7 \times 1 = 7$.

Step 4: Add these values together: $900 + 80 + 7 = 987$.

Therefore, the addition exercise in hundreds, tens, and units that results in the number 987 is $900 + 80 + 7 = 987$.