Number Transformation: Adding 7 to the Units Digit of 900

If you take the number 900 and increase its units digit by 7, then what number are you left with?

To solve this problem, we'll follow these steps:

• Step 1: Identify the units digit of the number 900, which is 0.
• Step 2: Increase this digit by 7, resulting in $0 + 7 = 7$.
• Step 3: Form the new number by combining the unchanged hundreds and tens digits with the newly computed units digit.

Now, let's work through each step:
Step 1: The units digit of 900 is 0.
Step 2: Adding 7 to the units digit gives us 7.
Step 3: The remaining digits (hundreds and tens digits in 900) remain unchanged, so the number becomes 907.

Therefore, the number you are left with after increasing the units digit by 7 is $907$.