Brainteasers
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Brainteasers
https://www.tes.com/magazine/archive/brainteasers-72
Line it up
Take these five cards:
Rearrange them in a row so that:
* the second card and the third card have a sum of 8;
* the third card and the fourth card have a sum of 6;
* the fourth card and the fifth card have a sum of 5.
Age 9-13
Count the rectangles
How many rectangles can you see in the diagram? (Hint: remember that a square is also a rectangle.)
What about in this diagram?
Brainteaser solutions
from page 30
Line it up
The order of cards is 2, 3, 5, 1, 4
Age old problems
There are 36 rectangles in a 3 x 3 grid of squares.
Squares:
nine 1 x 1; four 2 x 2;
one 3 x 3
Oblongs:
six 1 x 2; three 1 x 3;two 2 x 3; six 2 x 1;three 3 x 1; two 3 x 2
In a 4 x 4 grid there are 100 rectangles
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