Math practice for 13 year olds - page 157 of 414
Number of problems found: 8280
- Parallelogram ABCD
We have the parallelogram ABCD, where AB is 6.2 cm; BC is 5.4 cm and AC is 4.8 cm. Calculate the height on the AB side and the angle DAB. - Roof aluminum boards
To cover the pyramidal roof of the house, Mr. Drobný bought aluminum boards at 210 CZK per 1 m². How much CZK crowns did he pay for them if their consumption increased by 10% due to overlapping edges? - Pants shirt combinations
He has four types of pants. How many T-shirts does he have if he can dress 40 different ways? - The rectangular
The rectangular trapezoid has bases 15 dm and 8 dm long, and the length of the inclined arm is 12 dm. How long is the other arm of the trapezoid? - Safe wall percentage
The safe is 100 cm high, 80 cm wide, and 60 cm deep. Its internal space has a volume of 168 liters. What percentage of the total volume of the safe is occupied by the walls of the safe? - Ball diameter density
What is the diameter of the ball (for men) if it weighs 7,250 g and ρ = 7.8 g / cm³ - Six identical
Six identical compressors inflate 180 balloons in one hour. How many balloons inflate one compressor in 10 minutes? - Water cylinder
Zuzana poured 785 ml of water into a measuring cylinder with a base radius of 5 cm. The water in the cylinder reached a height of 2 cm from the upper edge. How tall is the cylinder? (π = 3.14) - Block wall diagonal
A block with dimensions a = 15 cm b = 5 cm and a block height c = 8 cm. Calculate the length of the wall diagonal in the base. - Calculate v,V
A) Calculate the speed from the path calculation formula. B) From the formula for calculating the volume of the cone, express the radius r. - Function table graph
Calculate and write in the table 10 values of the function f: y = 3x + 1, and the function's graph from them. - Arrange
Arrange the following in descending order: 0.32, 2on5, 27%, 1 on 3 - Trapezoid area angle Calculate the area of the isosceles trapezoid ABCD if a = 14 cm, c = 8 cm, and the size of the angle DAB is 52 °.
- Here are
There are white, blue, and red boats in a marina. Two-thirds of the boats are white, 4/7 of the remaining boats are blue, and the rest are red. If there are 15 red boats, how many boats are in the marina? Which tape diagram represents the number of white - Cuboid height volume A cube has an edge of 30 cm. The cuboid has dimensions of the lower base, 45 cm, and 10 cm. What is the height of a cuboid if it has the same volume as a cube?
- The triangle
The triangle has sides 5 cm long, 5 cm, and 8 cm long. What is the area of the triangle? - Bracelet wire length
Rachel wants to model a round bracelet with a diameter of 8 cm from copper wire. About how much wire does he need to make it if he needs to add 15% of its length to the eyelets? (π = 3.14) - Grandfather
Grandfather brought a full bucket of blueberries to the market and sold one-sixth of them in the morning. When he sold another 12 liters of blueberries in the afternoon, he had one-sixth of a bucket of blueberries left. How many liters of blueberries are - Equilateral Δ
What is the area of an equilateral triangle with a perimeter of 63 cm? - Steel roller
Calculate the weight of the steel roller if d = 2.4 cm, height v = 5.6 cm, and density ρ = 8 g/cm³.
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