What comes just before `9900000` ?

Options

A. `9899991`
B. `9899909`
C. `9999999`
D. `9899999`

Answer

To find out what comes just before `9900000`, we can follow these steps:

### Step 1: Understand the number
The number `9900000` is written in lakhs. In terms of digits, it is `99,00,000`.

### Step 2: Subtract 1 from the number
To find the number that comes just before `9900000`, we need to subtract `1` from it:
\[ 9900000 - 1 \]

### Step 3: Perform the subtraction
Let's perform the subtraction step by step:
- Start from the rightmost digit:
- The last digit is `0`. Since we cannot subtract `1` from `0`, we need to borrow from the left.
- Borrow `1` from the next `0`, making it `10`, and the next `0` becomes `9`.
- Now we have `10 - 1 = 9`.

- Moving to the next digit:
- The next digit is now `9` (after borrowing), so:
- `9 - 0 = 9`.

- The next digit is again `0` (after borrowing), so we need to borrow again:
- Borrow from the next `0`, making it `10`, and the next `0` becomes `9`.
- Now we have `10 - 1 = 9`.

- Continuing this process:
- The next digit is `9`, so `9 - 0 = 9`.
- The next digit is `9`, so `9 - 0 = 9`.
- The next digit is `9`, so `9 - 0 = 9`.

- Finally, we reach the leftmost digit:
- The leftmost digit is `9`, and since we borrowed from it, it becomes `8`.

Putting it all together, we get:
\[ 9900000 - 1 = 9899999 \]

### Step 4: Write the final answer
Therefore, the number that comes just before `9900000` is:
\[ 9899999 \]

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