CBSE Class 3 Mathematics Practice Worksheet Set 08

Question 1. Put the number of marbles in the cups such that each cup has equal number of marbles and show by repeated subtraction also. \(20 \div 4 =\) [box] [box] is the divisor [box] is the dividend [box] is the quotient
Answer: Total marbles = 20
Number of cups = 4
Marbles in each cup = \(20 \div 4 = 5\)
Repeated subtraction steps:
\(20 - 4 = 16\)
\(16 - 4 = 12\)
\(12 - 4 = 8\)
\(8 - 4 = 4\)
\(4 - 4 = 0\)
Divisor = 4
Dividend = 20
Quotient = 5
In simple words: When we divide 20 marbles equally among 4 cups, each cup gets 5 marbles.

Exam Tip: Remember that division is the same as repeated subtraction of the divisor until you reach zero.

Question 2. Using straight lines draw a figure.
Answer: A figure made using straight lines is a square or rectangle. Below is an example of a square drawn using straight line segments:
In simple words: Straight lines do not bend or curve. A square is made of 4 straight lines.

Exam Tip: Always use a ruler to draw straight lines neatly in geometry questions.

Question 3. Using curved lines only draw a figure.
Answer: A figure drawn using only curved lines is a circle:
In simple words: A circle is a round shape made with a single continuous curved line.

Exam Tip: Ensure the curved line completely closes without any gaps to form a proper closed figure.

Question 5. Using both straight and curved lines draw a figure and name it.
Answer: A semi-circle is an example of a figure made using both straight and curved lines (a straight diameter line and a curved arc):
Name of the figure: Semi-circle
In simple words: Some shapes use a mix of straight edges and round curves, like a semi-circle or an ice cream cone.

Exam Tip: Clearly label the name of the figure right below your drawing.

Question 6. Name the figure
a) I am a closed plane figure. I have four corners. All my sides are equal. What am I ?
Answer: Square
In simple words: A square has 4 equal sides and 4 corners.

Exam Tip: Remember that a rectangle also has 4 corners, but its opposite sides are equal, whereas a square has all sides equal.

Question 6. Name the figure
b) I am a closed plane figure. I have three corners. Who am I ?
Answer: Triangle
In simple words: A triangle is a 3-sided shape with 3 corners.

Exam Tip: The word 'tri' means three, which helps you remember triangles have 3 sides and 3 corners.

Question 6. Name the figure
c) I am a closed curved figure. I have one curved side but not corner. Who am I ?
Answer: Circle
In simple words: Circles are round and smooth with no sharp corners.

Exam Tip: A circle has zero corners and zero straight sides.

Question 7. Colour the box with blue for closed figure and green for open figure
Answer:
a. M-shape with gap / open figure -> Colour box Green
b. Open curve -> Colour box Green
c. Closed polygon -> Colour box Blue
d. T-shape with open endpoints -> Colour box Green
e. Closed quadrilateral -> Colour box Blue
f. Open letter R -> Colour box Green
In simple words: Closed figures start and end at the same point with no openings, while open figures have open ends.

Exam Tip: Trace the outline with your pencil; if your pencil can get out without crossing a line, the figure is open.

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