To find area of a rectangle when length and breadth are of different units we need to convert and write them in same units and then solve.

**For Example:**

**1.** Find the area of a rectangle whose length is 15 cm and breadth is 50 mm.

Solution:

Length (l) = 15 cm.

10 mm = 1 cm.

Therefore, 50 mm = 50/10 cm = 5 cm.

Breadth = 5 cm.

Area = l × b

= 15 × 5 sq. cm.

= 75 sq. cm.

**2.** Find the area of a rectangle whose length is 32 m and breadth is 200 cm.

Solution:

Length (l) = 32 m.

100 cm = 1 m.

Therefore, 200 cm = 200/100 m = 2 m.

Breadth = 2 m.

Area = l × b

= 32 × 2 sq. m.

= 64 sq. m.

**3.** Find the area of a rectangle whose length is 17 cm and breadth is 85 mm.

Solution:

Length (l) = 17 cm.

10 mm = 1 cm.

Therefore, 85 mm = 85/10 cm= 8.5 cm.

Breadth = 8.5 cm.

Area = l × b

= 17 × 8.5 sq. cm.

= 144.5 sq. cm.

**4.** Find the area of a rectangle whose length is 21 m and breadth is 500 cm.

Solution:

Length (l) = 21 m.

100 cm = 1 m.

Therefore, 500 cm = 500/100 m = 5 m.

Breadth = 5 m.

Area = l × b

= 21 × 5 sq. m.

= 105 sq. m.

**5.** Find the area of a rectangle whose length is 41 m and breadth is 400 cm.

Solution:

Length (l) = 41 m.

100 cm = 1 m.

Therefore, 400 cm = 400/100 m = 4 m.

Breadth = 4 m.

Area = l × b

= 41 × 4 sq. m.

= 164 sq. m.

**● Area.
**

**To find Area of a Rectangle when Length and Breadth are of Different
Units.**

**To find Length or Breadth when Area of a Rectangle is given.**

**To find Cost of Painting or Tilling when Area and Cost per Unit
is given.**

**To find the Number of Bricks or Tiles when Area of Path and Brick
is given.**

**Worksheet on Area of a Square and Rectangle**

**5th Grade Geometry**

**5th Grade Math Problems**

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