[ CBSE CLASS 6 / COMPUTATIONAL THINKING / CHAPTER 6 / 2026-27 ]

Class 6 Perimeter and Area: Computational Thinking Questions and Answers

The Perimeter and Area CT chapter asks students to break odd shapes into rectangles and squares, then reason about distance around (perimeter) and space inside (area). Splitting shapes is decomposition; seeing that a corner cut keeps the perimeter the same is abstraction.

Practise 6 questions Printable worksheet
Skills: Decomposition · Abstraction · Pattern recognition · Linked to Ganita Prakash Chapter 6: Perimeter and Area

[ WORKED EXAMPLE ]

What is the perimeter of a rectangle 8 cm long and 5 cm wide?

Answer: 26 cm.

  1. The sides are 8, 5, 8 and 5 cm.
  2. 8 + 5 + 8 + 5 = 26.
  3. Perimeter = 26 cm. (40 is the area in sq cm, a common mix-up.)

What this chapter is about

Students find perimeter and area of rectangles, squares and shapes made from them.

CT questions reward splitting a complex shape into simple pieces, then adding or subtracting areas.

Students discover surprising patterns: shapes with the same perimeter can have different areas, and cutting a square from a corner may not change the perimeter at all.

[ PRACTICE MODE / 6 QUESTIONS ]

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AbstractionQuestion 1 of 6 · Score 0

What is the perimeter of a rectangle 8 cm long and 5 cm wide?

Choose one answer

All Perimeter and Area questions with answers

Try each one first, then open it to check the answer and the reasoning.

Q1What is the perimeter of a rectangle 8 cm long and 5 cm wide?
  • 13 cm
  • 26 cm
  • 40 cm
  • 80 cm

Answer: B. 26 cm

Hint: Perimeter is the total length around all four sides.

  1. The sides are 8, 5, 8 and 5 cm.
  2. 8 + 5 + 8 + 5 = 26.
  3. Perimeter = 26 cm. (40 is the area in sq cm, a common mix-up.)

Skill: Abstraction · Level: easy · Report an error

Q2What is the area of a square with side 7 cm?
  • 14 sq cm
  • 28 sq cm
  • 49 sq cm
  • 56 sq cm

Answer: C. 49 sq cm

Hint: Area of a square = side × side.

  1. Area = 7 × 7.
  2. 7 × 7 = 49.
  3. Area = 49 sq cm. (28 cm is its perimeter.)

Skill: Abstraction · Level: easy · Report an error

Q3A 6 cm × 4 cm rectangle has a 2 cm × 2 cm square cut from one corner. What is the area of the shape left?
  • 16 sq cm
  • 20 sq cm
  • 22 sq cm
  • 24 sq cm

Answer: B. 20 sq cm

Hint: Find the whole rectangle’s area, then take away the square.

  1. Whole rectangle: 6 × 4 = 24 sq cm.
  2. Square removed: 2 × 2 = 4 sq cm.
  3. 24 − 4 = 20 sq cm.

Skill: Decomposition · Level: medium · Report an error

Q4For that same L-shape (a 6 cm × 4 cm rectangle with a 2 cm × 2 cm corner square removed), what is the perimeter?
  • 16 cm
  • 18 cm
  • 20 cm
  • 24 cm

Answer: C. 20 cm

Hint: Imagine pushing the two inner edges of the cut back out to the corner.

  1. Removing the corner takes away 2 cm + 2 cm of the outer edge.
  2. It adds two new inner edges of 2 cm + 2 cm.
  3. The total is unchanged: 2 × (6 + 4) = 20 cm.

Skill: Abstraction · Level: challenge · Report an error

Q5Each rectangle below has a perimeter of 20 cm. Which has the largest area?
  • 8 cm × 2 cm
  • 7 cm × 3 cm
  • 6 cm × 4 cm
  • 5 cm × 5 cm

Answer: D. 5 cm × 5 cm

Hint: Work out each area and look at the pattern as the sides get closer.

  1. Areas: 8 × 2 = 16, 7 × 3 = 21, 6 × 4 = 24, 5 × 5 = 25.
  2. The closer the sides are to equal, the bigger the area.
  3. The 5 × 5 square has the largest area.

Skill: Pattern recognition · Level: medium · Report an error

Q6Ravi walks around a park 50 m long and 30 m wide 3 times. How far does he walk?
  • 240 m
  • 450 m
  • 480 m
  • 4,500 m

Answer: C. 480 m

Hint: First find one round, then multiply.

  1. One round = 2 × (50 + 30) = 160 m.
  2. Three rounds = 3 × 160.
  3. 3 × 160 = 480 m.

Skill: Decomposition · Level: medium · Report an error

Frequently asked questions

What does the Class 6 Perimeter and Area Computational Thinking chapter cover?

The Perimeter and Area CT chapter asks students to break odd shapes into rectangles and squares, then reason about distance around (perimeter) and space inside (area). Splitting shapes is decomposition; seeing that a corner cut keeps the perimeter the same is abstraction.

Which computational thinking skills does Perimeter and Area use?

Perimeter and Area mainly practises decomposition, abstraction, pattern recognition. It links to Ganita Prakash Chapter 6: Perimeter and Area.

Where are the official CBSE Perimeter and Area questions?

The official questions are in the CBSE Class 6 Computational Thinking and AI handbook for 2026-27, free on the CBSE Academic website. The practice on this page is original and mapped to the same chapter.

More Class 6 chapters