What is the excess of 90 over 53.865 ?

Answer

To find the excess of 90 over 53.865, we need to subtract 53.865 from 90. Here’s how to do it step by step:

### Step 1: Set up the subtraction
We will write the numbers in a way that makes it easy to subtract. We can express 90 as 90.000 to align the decimal points.

\[ 90.000 - 53.865 \]

### Step 2: Subtract the numbers
Now we will perform the subtraction column by column, starting from the rightmost digit.

1. **Subtract the thousandths place**:
- 0 (from 90.000) - 5 (from 53.865) cannot be done, so we need to borrow from the next column.
- Borrow 1 from the hundredths place (which is 0), making it 10 (0 becomes 9) and then we can subtract:
- 10 - 5 = 5

2. **Subtract the hundredths place**:
- Now we have 9 (from the borrowing) - 6 = 3

3. **Subtract the tenths place**:
- 0 (from 90.000 after borrowing) - 8 cannot be done, so we need to borrow again.
- Borrow 1 from the units place (which is now 8), making it 10 (8 becomes 7) and then we can subtract:
- 10 - 8 = 2

4. **Subtract the units place**:
- 7 - 3 = 4

5. **Subtract the tens place**:
- 9 - 5 = 4

Putting it all together, we have:

\[ 90.000 - 53.865 = 36.135 \]

### Final Answer:
The excess of 90 over 53.865 is **36.135**.

---