Write the three whole numbers occurring just before 1001.

Answer

To find the three whole numbers that occur just before 1001, we can follow these steps:

### Step 1: Identify the number before 1001
To find the first whole number before 1001, we subtract 1 from 1001:
\[ 1001 - 1 = 1000 \]

### Step 2: Find the second whole number before 1001
Next, we subtract 1 from the number we just found (1000):
\[ 1000 - 1 = 999 \]

### Step 3: Find the third whole number before 1001
Now, we subtract 1 from the number we found in the previous step (999):
\[ 999 - 1 = 998 \]

### Final Answer
The three whole numbers occurring just before 1001 are:
- 1000
- 999
- 998