Let's break down this equation and convert everything to the same unit of measurement before solving it.

1. **Given equation:**

   \[
   7 \, \text{kg} - 9 \, \text{pon} + 300 \, \text{g} = \text{ons}
   \]

Where:
- 1 kg = 1000 grams
- 1 pon (pond) = 500 grams
- 1 ons = 100 grams

2. **Convert everything to grams:**

   \[
   7 \, \text{kg} = 7 \times 1000 = 7000 \, \text{g}
   \]
   \[
   9 \, \text{pon} = 9 \times 500 = 4500 \, \text{g}
   \]
   \[
   300 \, \text{g} = 300 \, \text{g} \quad (\text{no conversion needed})
   \]

3. **Substitute into the equation:**

   \[
   7000 \, \text{g} - 4500 \, \text{g} + 300 \, \text{g} = \text{ons}
   \]

4. **Simplify the left-hand side:**

   \[
   7000 - 4500 + 300 = 2800 \, \text{g}
   \]

5. **Convert the result into ons:**

   Since \( 1 \, \text{ons} = 100 \, \text{g} \):

   \[
   \frac{2800}{100} = 28 \, \text{ons}
   \]

Thus, the result is:

\[
28 \, \text{ons}
\]

Would you like more details or have any questions? Here are some related problems you might find useful:

1. Convert 5 kg - 7 pon + 200 grams to ons.
2. How many ons are in 9.5 kg?
3. Convert 12 pon + 500 grams to kilograms.
4. How many pon are equivalent to 6.4 kg?
5. Simplify \(10 \, \text{kg} - 4 \, \text{pon} + 600 \, \text{g}\) into ons.

**Tip:** Always convert all units into the same measurement to make calculations easier and more accurate.

Learn how to convert units in the equation 7kg - 9 pon + 300 grams to ons. This problem involves unit conversions between kilograms, pons, and grams, making it suitable for students in Grades 5-7. Includes step-by-step guidance.

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