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Let's break down the problem.

- The garden is a square plot with dimensions \( 7 \, \text{m} \times 7 \, \text{m} \).
- The perimeter of a square is calculated as:

\[
\text{Perimeter} = 4 \times \text{side length}
\]

Since each side of the garden is 7 meters, the perimeter is:

\[
\text{Perimeter} = 4 \times 7 = 28 \, \text{m}
\]

- Mr. Johnson needed an extra \( 3.4 \, \text{m} \) of fence, which means the total length of fence he initially had is:

\[
\text{Total Fence Length} = 28 \, \text{m} - 3.4 \, \text{m} = 24.6 \, \text{m}
\]

Thus, the length of the fence that Mr. Johnson originally had is **24.6 meters**.

Would you like more details or further clarifications? Here are some related questions you can explore:

1. What is the formula for calculating the perimeter of a square?
2. How would the problem change if the garden were rectangular, not square?
3. If Mr. Johnson wanted to increase the garden's size, how much additional fence would be needed for each extra meter of side length?
4. How would you solve the problem if the extra fencing needed was given as a percentage instead of a length?
5. Can you calculate how much area the fenced plot covers?

**Tip:** Always break down the problem into simple, manageable steps. It helps avoid mistakes and provides clarity.

Mr. Johnson had a plot of garden that is 7 m by 7 m. He wanted to put a fence around the whole garden. He needed an extra 3.4 m of fence. What is the length of fence that he had?

Learn how to calculate the perimeter of a 7m by 7m square garden and find out the original length of fence Mr. Johnson had before needing an extra 3.4 m. This problem involves perimeter calculation and basic linear measurements, suitable for Grades 4-6.

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