Page 183 - MathGPT_V1.0_C5

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Learning by Doing

Objective: To understand the concept of turn through a paper windmill.

Materials Required: A square piece of paper, thumb pin, a stick of 15 cm in
length and a pair of scissors.
Procedure:
Š Take square piece of paper and fold it diagonally along both diagonals.
Š Make creases along both diagonals.

Š Open it and draw a small circle at the point of intersection of diagonals.
Š Cut from one corner along the diagonal fold and stop cutting at a reliable distance from
the centre.

Š Repeat along the other diagonal folds.
Š Fold four alternate corner sections down to the centre
of the paper, holding each section under your thumb at
the centre as you work.
Š Place a sticker centrally on the windmill so that it holds the four blades in
position.

Š Take a thumb pin and push it through the centre of the sticker and out the
back of the windmill.
Š Fix it on a stick firmly so that it allows the windmill to turn.

1
1
Š Now, rotate the windmill turn and turn to observe its shapes.
4 2

maths fun
This is the fun way to add numbers in a series. Observe the 1+2+3+4+5+6+7

method given alongside to add numbers and find the sum 8
of the following. 8
1. 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 8

2. 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + ... + 20 3 × 8 + 4 = 24 + 4 = 28

Brain Sizzlers
In the given figures, shade two more squares so that the dashed line becomes a line of symmetry.
1. 2. 3.

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