Symmetry Block Activity Sheet (teacher made) - Twinkl - Free Printable

It looks like you've uploaded an image of a symmetry worksheet designed to help students practice completing patterns using line symmetry (reflection symmetry). The task is to shade squares in the blank half of each grid so that the completed picture is symmetrical across the vertical line drawn down the middle.

Let’s go through how to solve this step-by-step and explain the logic behind it.

---

🔍 Understanding the Task

Each grid has:
- A vertical line of symmetry (dashed or solid line down the center).
- One side of the grid already shaded with colored squares.
- The other side is blank.
- Your job: Complete the pattern by shading squares on the blank side so that the figure is symmetrical.

> Symmetry means that for every shaded square on one side, there should be a matching shaded square at the same distance from the line of symmetry on the opposite side.

---

✔ Step-by-Step Solution Method

1. Identify the line of symmetry — it's the vertical line dividing the grid into two equal halves.
2. Look at each shaded square on the left side.
3. Find its mirror image on the right side:
- Count how many columns away it is from the line.
- Shade the same position on the opposite side.
4. Repeat for all shaded squares.

Let’s analyze each example:

---

🟦 Example 1: Top Left (Red)

- Shaded squares are on the left side, forming a sort of "L" shape.
- Mirror each red square:
- The top-left red square is 1 column left of the line → shade 1 column right of the line.
- The bottom-left red square is 2 columns left → shade 2 columns right.
- So, draw the same pattern mirrored on the right.

✔ Result: A symmetrical "L" shape on both sides.

---

🟧 Example 2: Top Right (Orange)

- Orange squares form a diagonal pattern on the left.
- Mirror each:
- Top orange square is 1 column left → place 1 column right.
- Middle one is 2 columns left → place 2 columns right.
- Bottom one is 3 columns left → place 3 columns right.
- The result will be a diagonal going downward on the right side.

✔ Result: Diagonal mirrored across the center.

---

🟡 Example 3: Middle Left (Yellow)

- Yellow squares form a "T" shape on the left.
- Mirror each:
- Top yellow square is 1 column left → mirror to 1 column right.
- Middle one is 2 columns left → mirror to 2 columns right.
- Bottom one is 3 columns left → mirror to 3 columns right.
- But note: the base of the "T" is wider? Wait — actually, it's a single column of three squares with a horizontal bar above.

Wait — let's clarify:

Looking closely:
- There’s a horizontal yellow bar at the top (two squares wide) on the left.
- Then a vertical stack below it (three squares high).

But only one column is shaded on the left? Actually, the yellow pattern is:
- Column 1: Three squares shaded (top to bottom).
- Column 2: One square shaded at the top (forming a "T").

So mirror:
- Column 1 (left): 3 shaded → mirror to column 1 (right), 3 shaded.
- Column 2 (left): top shaded → mirror to column 2 (right), top shaded.

So on the right:
- Column 1: 3 shaded squares.
- Column 2: top shaded.

That makes a mirrored "T".

✔ Complete the "T" on the right.

---

🟩 Example 4: Middle Right (Green)

- Green pattern: Two columns on the left.
- First column: top and bottom shaded.
- Second column: middle shaded.
- This forms a kind of "hourglass" or "diamond" shape?

Wait — actually:
- Column 1: top and bottom shaded.
- Column 2: middle shaded.

So mirror:
- On the right:
- Column 1: top and bottom shaded.
- Column 2: middle shaded.

So the full shape is symmetric — like a diamond or X made of blocks.

✔ Complete the same pattern on the right.

---

🔵 Example 5: Bottom Left (Blue)

- Blue squares form a "U" shape on the left.
- Left side:
- Column 1: top and bottom shaded.
- Column 2: top shaded.
- Column 3: bottom shaded.

Wait — actually:
- It looks like a step or staircase:
- Column 1: top shaded.
- Column 2: top and middle shaded.
- Column 3: top, middle, bottom shaded.

No — wait again: Let's count.

Actually, looking at the blue:
- Only one column has multiple squares?
- No — it appears:
- Column 1: top shaded.
- Column 2: top and middle shaded.
- Column 3: top, middle, bottom shaded.

This is a diagonal staircase going up and to the right.

To reflect:
- Each shaded square on the left must have a corresponding one on the right, same distance from the line.

So:
- Column 1 (left): top → mirror to column 1 (right), top.
- Column 2 (left): top and middle → mirror to column 2 (right), top and middle.
- Column 3 (left): top, middle, bottom → mirror to column 3 (right), top, middle, bottom.

Wait — but the line of symmetry is between column 3 and 4.

So:
- Left side: columns 1–3
- Right side: columns 4–6

So if the left side has:
- Col 1: top shaded → mirror to col 6 (same distance from line)
- Col 2: top and middle → mirror to col 5
- Col 3: top, middle, bottom → mirror to col 4

So:
- Col 6: top shaded
- Col 5: top and middle shaded
- Col 4: top, middle, bottom shaded

This creates a mirrored staircase on the right.

✔ So shade accordingly.

---

💚 Example 6: Bottom Right (Green)

- Green squares on the left:
- Column 1: top shaded.
- Column 2: middle shaded.
- Column 3: bottom shaded.

This is a diagonal from top-left to bottom-right.

Mirror:
- Col 1 → Col 6 (top shaded)
- Col 2 → Col 5 (middle shaded)
- Col 3 → Col 4 (bottom shaded)

So on the right:
- Col 6: top
- Col 5: middle
- Col 4: bottom

This completes a diagonal from top-right to bottom-left.

✔ Final shape is a diagonal cross.

---

✔ Summary of How to Solve

For each shaded square on the left:
- Determine its column number.
- Find the mirror column on the right (e.g., if line is between col 3 & 4, then col 1 mirrors to col 6, col 2 to col 5, col 3 to col 4).
- Shade the same row and mirror column.

Repeat for all shapes.

---

🖨️ Printable Version Note

The image shows two versions:
- Left: Standard printable.
- Right: "Ink saving Eco" version — likely uses less color or fewer shades.

But the task remains the same: complete the symmetry.

---

✔ Final Answer (What to Do)

To solve the worksheet:
1. For each grid, identify the line of symmetry.
2. For every shaded square on the left, find its mirror position on the right.
3. Shade the corresponding square on the right.
4. Repeat until the entire figure is symmetrical.

> Example: If a red square is in row 2, column 1 (on the left), and the line is between col 3 and 4, then its mirror is in row 2, column 6 (since 1 is 2 columns left of the line → 2 columns right = col 6).

---

Would you like me to provide a visual guide or sketch the completed grids in text form?