Math practice for 13 year olds - page 157 of 413
Number of problems found: 8260
- 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. - Rectangle area
The rectangle's length is 35% larger than its width, and the circumference is 188 cm. Calculate its area. - Tank 28
The tank is shaped like a cuboid. The base is rectangular; one side of the rectangle is 40 cm long, and the diagonal of this rectangle is 50 cm. The height of the tank is 1.5 m. We start filling the tank with water at a rate of 1 litre per second. No wate - Three days way
The tourist walked a quarter of the way on the first day, a third of the rest on the second day, and 20 km on the last day. How many km did he cover in three days? - Right-angled triangle base
Find the volume and surface area of a triangular prism with a right-angled triangle base if the length of the prism base legs are 7.2 cm and 4.7 cm and the height of the prism is 24 cm. - Cube volume liters
Calculate the volume of a cube whose surface is 15,000 cm². Express the result in liters. - Isosceles trapezoid area Calculate the area of an isosceles trapezoid ABCD, whose longer base measures 48 cm, the shorter base measures 3/4 of the longest base, and the leg of the trapezoid measures 2/3 of the longer base. The result is rounded to the nearest hundredth.
- Cylinder oil liters
The shaped container with a bottom diameter of 25 cm and a height of 30 cm is half-filled with oil. How many liters of oil are in the container? Please round the result to three decimal places. - Translate
Translate the following mathematical statement into an algebraic expression or equation. 1. Nine less than the quotient of a number and 3 2. The ratio of 3 and the sum of 4 and an unknown number 3. Eighty is the product of 4 and g 4. The sum of x and 18 i - ID tag
How many three-digit ID-tag can be made if: a) a digit cannot be used more than once b) the 1st digit must be five, and repetition of the others is not permitted. - Bulbs in a motorcycle
In a motorcycle there is a battery with a voltage of 6 V. To the battery two devices are connected side by side. The first device is the bulb of the tail-light with an electrical resistance of 12 Ohm. The second is the bulb of the headlight with an electr - Forest land
The land area of 320 hectares has 30% wood. How many hectares of land are not afforested? - Student meeting attendance
Three times more boys than girls attended the student meeting. When 8 boys and 8 girls left early, five times more boys than girls stayed at the meeting. How many boys and how many girls were at the game?
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