Math practice for 13 year olds - page 132 of 413
Number of problems found: 8253
- Box cube paper
The open box has the shape of a cube. We used 80 dm² of paper to glue on it. What is the volume of this box? - SMS message ratio
Jane, Patricia, and Andrea sent an SMS to Superstar. The number of messages they sent was in the ratio 4:3:2, with Andrea sending 35 fewer text messages than Jane and Patricia combined. How many text messages did all 3 girls send together? - Loader pressure change
How does the pressure value change when we load a loader with the same weight as the car? - Venus volume surface
Calculate the volume and surface of the planet Venus if its circumference is 12,000 km. - Truck rail pressure
How much pressure on the rails will cause an empty truck weighing 20 tons if the contact area of all wheels and rails is 16 square centimeters? - Allan 2
Allan wants to buy a shirt regularly priced at PHP 265. The shirt Is on sale for 15% of the regular price. Which equation can be used to determine the sale price of the shirt? - Wheel force lever
The center of force on the wheel is 1.2 m from the axis of rotation, and the load is attracted by the earth's gravitational force equal to 800 newtons at a distance of 40 cm from the axis of rotation. How much force F2 does the worker lift the wheel? - Perimeter - triangle
Construct triangle ABC when we know a + b + c (perimeter), height to side c, and angle gamma. - Magnetite iron production
Iron is produced in a blast furnace from iron ore. The wealthiest iron ore is magnetite, which contains 45-70% iron. How much magnetite do we need to get 3 tons of iron? - Pipe thickness
The outer circumference of the tube is 32 cm. Its length is 60 cm, its density is 8.5 g/cm3, and its weight is 9.495 kg. Calculate the wall thickness of the pipe. - Iso triangle
An isosceles triangle with a base of 8 cm. Its perimeter is 28 cm. Calculate the height of the triangle. - Rocks
Dana loves rocks! She has six pieces of granite, three pieces of marble, 14 pieces of sandstone, and one piece of slate. What is the ratio of sandstone pieces to marble in Dana's collection? - Salaries
The employer increased the salaries of its three employees by an average of 30 euros. One increased his salary by € 20, the other by € 45. How many euros did he raise the salary of a third employee? - Circumference - diamond
The diamond has an area of 21.6 cm². Its height is 4 cm. What is the circumference of the diamond? - Create 2
Create word problems based on the given number sentence (300/24) - (207.60/24) = N. - A turtle 2
A turtle can walk 1/12 of a kilometre in an hour. The turtle is 1/5 of a kilometre away from a pond. How long will it take the turtle to reach the pond at this speed? - Cylinder cube percentage
Calculate the percentage of the cube volume that represents the volume of the cylinder inscribed in the cube. The cylinder's bases are circles inscribed on two opposite walls of the cube with an edge a = 14 cm. - Two companies
Two companies completed a job together in 100 days. The first company alone could complete the job in 150 days. How long would the second company take to complete the job alone? - Resistor voltage current
A current of 5 mA flows through a resistor with an electrical resistance of 600 Ω. What electrical voltage do we measure between the resistor terminals? - Voltage - Kirchoff laws At a voltage of 2.5 V, a current I1= 20 mA flows through the resistor. What will the voltage be at the resistor's ends when the current I2= 1,2 A passes through it?
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