All Tasks
The population
The population of a town is 20.000 citizens. From them 8.206 are men. Men are 426 fewer than women. How many children are living in the town?
# Operations with natural numbers
Training
5
Distributive Property in Algebraic Expressions_2
Match the following algebraic expressions:
1. $4(x-2)-3+x$
2. $3(x-2)-(x-3)$
3. $-2(-x+2)+3(x+2)$
4. $-(x-2)+3(x-2)$
to its equivalent simplified expression, by writing the number of expression to the right
# Terms with variables
Training
8
Granit prism
Calculate the volume of the granit block. Round the result in m³ to two decimal places.
# Cubes & cuboids
Training
8
Granit bench
Calculate the weight of the sitting part of a granit bench. The sitting part of the bench has the following dimensions: width 43 cm, height 13 cm, length 180 cm. The density of granit is 2600 kg/m³. Give the result rounded to the nearest whole in kilograms.
# Cubes & cuboids
Reasoning
8
Cobblestones
One cobblestone is a cube with the edge 8 cm long. How many of these cobblestones fit to one cubic meter? Give the result as a whole number.
# Cubes & cuboids
Modeling
8
A problem of one euro
A 1 euro coin is made of a bimetallic layered composition: cupronickel for the silver part (internal) and brass for the gold part (external).
The euro has a 23.25 mm diameter.
What is the radius of the inner circumference if the distance between the golden (outer) and silver (inner) circumferences is d = 3 nm?
# Circle
Training
5