Todas as tarefas
The sum of the 10 first squares
Look at these pyramids. They are made of square pieces, all of the same height, which is the depth of each step. Hence their volume is the sum of the squares. You have six of them to make a cuboid. If there are ten stairs, what is the size of this cuboid made of the six pyramids?
# Monomials & polynomials
Modeling
8
The turning points
Now, let's turn our attention to the corners, the turning points, alternating bottom-left, top-left, top-right and bottom-right, beginning with 1, 2, 3, 5, 7...
# Operations with natural numbers
Reasoning
5
Equivalent expressions
Which of the following expressions is equivalent to 3k+6?
# Numbers & operations
Reasoning
8
From natural to algebraic language
Translate the following sentence in algebraic language:
The square of an even number
# Numbers & operations
Training
8
Associative property for the sum
If a+b=9 then a+b+5=?
# Numbers & operations
Training
8
Origami- Challenging
El Origami o papiroflexia es un arte que consiste en el plegado de papel sin usar tijeras ni pegamento para obtener figuras de formas variadas. En la imagen se puede ver cómo se construye una caja sencilla a partir de una hoja de papel de forma cuadrada.
Si la hoja de papel de partida es un cuadrado de lado 20 cm, ¿en cuántos centímetros habría que disminuir cada lado del papel inicial para que la base de la caja obtenida tuviese de lado 6 cm?
# Quadratic equations
Modeling
8