Perimeters of squares and rectangles | 3rd grade Math Worksheet ... - Free Printable

Let’s solve this step by step.

We are asked to find the perimeters of squares and rectangles.
Remember:
→ For a rectangle, perimeter = 2 × (length + width)
→ For a square, all sides are equal, so perimeter = 4 × side length

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First row:

1. Rectangle: 5 m and 3 m
Perimeter = 2 × (5 + 3) = 2 × 8 = 16 m

2. Square: 2 yd each side
Perimeter = 4 × 2 = 8 yd

3. Rectangle: 2 mi and 3 mi
Wait — looking at the image, it says “2 mi” on top and “3 mi” on the side? Actually, in the image, for the third shape in first row, it shows “2 mi” on top and “3 mi” on the right side → so it’s a rectangle with length 3 mi and width 2 mi.
Perimeter = 2 × (3 + 2) = 2 × 5 = 10 mi

But wait — let me double-check the original problem layout.

Actually, looking again at the user’s image description (even though we don’t describe images), from standard worksheet layout:

First row after example:
- First shape: labeled 5m (top), 3m (side) → rectangle → 2*(5+3)=16m
- Second shape: square, labeled 2yd on one side → 4*2=8yd
- Third shape: rectangle, labeled 2mi (top), 3mi (side) → 2*(2+3)=10mi

Second row:

4. Rectangle: 3 cm and 2 cm → 2*(3+2)=2*5=10 cm

5. Square: 1 m each side → 4*1=4 m

6. Rectangle: 4 ft and 1 ft → 2*(4+1)=2*5=10 ft

Third row:

7. Square: 4 m each side → 4*4=16 m

8. Rectangle: 4 cm and 3 cm → 2*(4+3)=2*7=14 cm

9. Square: 2 km each side → 4*2=8 km

Wait — let me check if any shapes are misread.

In third row, first shape is labeled “4 m” on left and bottom? If it’s a square, then yes, 4x4=16m.

Second shape in third row: labeled “4 cm” on top, “3 cm” on side → rectangle → 2*(4+3)=14cm

Third shape: labeled “2 km” on top and side → square → 4*2=8km

All good.

Now list them in order as they appear in the worksheet (left to right, top to bottom):

Row 1:
- 16 m
- 8 yd
- 10 mi

Row 2:
- 10 cm
- 4 m
- 10 ft

Row 3:
- 16 m
- 14 cm
- 8 km

Double-check calculations:

1. 2*(5+3)=16 ✔️
2. 4*2=8 ✔️
3. 2*(2+3)=10 ✔️
4. 2*(3+2)=10 ✔️
5. 4*1=4 ✔️
6. 2*(4+1)=10 ✔️
7. 4*4=16 ✔️
8. 2*(4+3)=14 ✔️
9. 4*2=8 ✔️

All correct.

Final Answer:
16 m, 8 yd, 10 mi, 10 cm, 4 m, 10 ft, 16 m, 14 cm, 8 km