Math practice for 13 year olds - page 129 of 428
Number of problems found: 8558
- Weekly student selection
There are 16 students in the class. If the teacher wants to choose two students who will be weekly, how many options does she have? - Determine 6
Determine the least common denominator 3/4 and -5/6 - Male players
In the game, 15 players played, and there were six males. What percent of males played in the game? - Conductor resistance
Calculate the resistance value of the electrical conductor if it is connected to a voltage of 12 V and an electric current of 0.3 A passes through it. - Iron electrical resistance
The iron is connected to a 230 V power supply with a current of 5000 mA. Calculate the electrical resistance of the iron. - Plan road scale
A 3.5 cm-long line shows the 350 m-long road on the plan. What is the project's scale? - 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
Jana, Petra, 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 Jan and Peter 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? - 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 32cm. Its length is 60cm, its density is 8.5g/cm3, and its weight is 9.495kg. Calculate the wall thickness of the pipe. - Iso triangle
An isosceles triangle with a base of 8 cm. Its circumference 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 cm square. 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.
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