Spelling worksheet for practicing the /er/ sound with missing letters "er," "ur," or "ir" in words.

Problem Description:

The task is to fill in the missing letters in words so that they contain the `/er/` sound. The possible spellings for this sound are er, ur, and ir. We need to choose the correct spelling for each word.

Solution Approach:

1. Identify the missing letters in each word.
2. Determine which of the spellings (`er`, `ur`, `ir`) fits the word based on its meaning and pronunciation.
3. Fill in the correct spelling for each word.

Step-by-Step Solution:

#### First Row:
- wint__: The word is "winter." The missing letters are "er."
- Correct spelling: winter
- st__: The word is "ster." The missing letters are "er."
- Correct spelling: ster
- st__: The word is "stir." The missing letters are "ir."
- Correct spelling: stir

#### Second Row:
- c__l: The word is "curl." The missing letters are "ur."
- Correct spelling: curl
- f__m: The word is "farm." The missing letters are "er."
- Correct spelling: farm
- b__th: The word is "birth." The missing letters are "ir."
- Correct spelling: birth

#### Third Row:
- th__d: The word is "thread." The missing letters are "er."
- Correct spelling: thread
- t__n: The word is "tern." The missing letters are "er."
- Correct spelling: tern
- ret__n: The word is "return." The missing letters are "ern."
- Correct spelling: return

#### Fourth Row:
- b__th: The word is "both." The missing letters are "oth."
- Correct spelling: both
- pow__: The word is "power." The missing letters are "er."
- Correct spelling: power
- ch__ch: The word is "church." The missing letters are "ur."
- Correct spelling: church

#### Fifth Row:
- f__n: The word is "fun." The missing letters are "un."
- Correct spelling: fun
- c__cle: The word is "circle." The missing letters are "ir."
- Correct spelling: circle
- f__st: The word is "first." The missing letters are "irst."
- Correct spelling: first

#### Sixth Row:
- flow__: The word is "flower." The missing letters are "er."
- Correct spelling: flower
- b__d: The word is "bird." The missing letters are "ird."
- Correct spelling: bird
- point__: The word is "pointer." The missing letters are "er."
- Correct spelling: pointer

#### Seventh Row:
- bak__: The word is "baker." The missing letters are "er."
- Correct spelling: baker
- ev__: The word is "ever." The missing letters are "er."
- Correct spelling: ever
- sh__t: The word is "shirt." The missing letters are "irt."
- Correct spelling: shirt

#### Eighth Row:
- n__se: The word is "nurse." The missing letters are "ur."
- Correct spelling: nurse
- p__ple: The word is "purple." The missing letters are "urple."
- Correct spelling: purple
- h__: The word is "her." The missing letters are "er."
- Correct spelling: her

#### Ninth Row:
- th__ty: The word is "thirty." The missing letters are "ir."
- Correct spelling: thirty
- fing__: The word is "finger." The missing letters are "er."
- Correct spelling: finger
- laugh__: The word is "laughter." The missing letters are "ter."
- Correct spelling: laughter

#### Tenth Row:
- cl__k: The word is "clock." The missing letters are "ock."
- Correct spelling: clock
- sk__t: The word is "skirt." The missing letters are "irt."
- Correct spelling: skirt
- h__d (of animals): The word is "herd." The missing letters are "erd."
- Correct spelling: herd

#### Eleventh Row:
- hung__: The word is "hungry." The missing letters are "ry."
- Correct spelling: hungry
- winn__: The word is "winner." The missing letters are "er."
- Correct spelling: winner

Final Answer:

```
winter, ster, stir
curl, farm, birth
thread, tern, return
both, power, church
fun, circle, first
flower, bird, pointer
baker, ever, shirt
nurse, purple, her
thirty, finger, laughter
clock, skirt, herd
hungry, winner
```

Boxed Answer:
\boxed{
\begin{array}{ccc}
\text{winter} & \text{ster} & \text{stir} \\
\text{curl} & \text{farm} & \text{birth} \\
\text{thread} & \text{tern} & \text{return} \\
\text{both} & \text{power} & \text{church} \\
\text{fun} & \text{circle} & \text{first} \\
\text{flower} & \text{bird} & \text{pointer} \\
\text{baker} & \text{ever} & \text{shirt} \\
\text{nurse} & \text{purple} & \text{her} \\
\text{thirty} & \text{finger} & \text{laughter} \\
\text{clock} & \text{skirt} & \text{herd} \\
\text{hungry} & \text{winner} & {}
\end{array}
}