Mathematics, 24.10.2020 16:10 Daddysgirl2019

ORJECTIVE To find the sum of first n natural
numbers.
MATERIAL REQUIRED
Cardboard, coloured papers, white
paper, cutter, adhesive.
METHOD OF CONSTRUCTION
1. Take a rectangular cardboard of a convenient size and paste a coloured paper
on it. Draw a rectangle ABCD of length 11 units and breadth 10 units.
2. Divide this rectangle into unit squares as shown in Fig. 1.
3. Starting from upper left-most corner, colour one square. 2 squares and so
on as shown in the figure.
DEMONSTRATION
1. The pink colour region looks like a stair case.
2. Length of 1st stair is 1 unit, length of 2nd stair is 2 units, length of 3rd stair
3 units, and so on, length of 10th stair is 10 units.

Answers: 1

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ORJECTIVE To find the sum of first n natural
numbers.
MATERIAL REQUIRED
Cardboard, c...

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