Q1
The square of 9 is:
A81
B18
C72
D90
CBSEClass 8 (CBSE)MathematicsCh 1 · Topic 1
Perfect Squares
Learning to identify and calculate perfect squares of numbers.
Core concept
Perfect squares always end in specific digits: 0, 1, 4, 5, 6, or 9 — never in 2, 3, 7, or 8, a useful quick check to rule out whether a number could be a perfect square. Patterns also exist among perfect squares, like the fact that the difference between consecutive perfect squares always increases by 2 (1,4,9,16... differ by 3,5,7...), reflecting a deeper algebraic identity connecting squares and odd numbers.
Exam highlight
Key diagram
Keywords worth remembering
Trending
perfect squarescbse class 8
Most searched
CBSE class 8 perfect squares
Quick revision
Study resources
Notes & downloads
Quick notes
• A perfect square is formed by multiplying an integer by itself (e.g., 4, 9, 16, 25).
• Perfect squares always end in 0, 1, 4, 5, 6, or 9 — never 2, 3, 7, or 8.
• The difference between consecutive perfect squares increases by 2 each time.
• Perfect squares are directly related to the area of a square shape.