Math practice for 13 year olds - page 301 of 420
Number of problems found: 8400
- Diamond angles
The diagonals in diamond KLMN are 10 cm and 6 cm long. Determine the angle size that the longer diagonal makes with the side of the diamond. - Tricolors
From the colors - red, blue, green, black, and white, create all possible tricolors. - Water drainage
1000 l of water will drain in one outflow in 4 hours. How many hours will it take for 3 drains to empty 9000 l? - Acres
For two hours, 24 students harvested chestnuts on 36 acres. How many square meters are harvested by one student per hour? - Clock hands
How many times less would the hour hand per week describe if it was as long as the minute hand? - Ratio 11
Simplify this ratio 10: 1/4 - Cuboid - volume and areas
The cuboid has a volume of 250 cm3, a surface of 250 cm2, and one side 5 cm long. How do I calculate the remaining sides? - Apple weight
The box with apples weighs x kg. Empty box y kg. How many kilograms of apples are in twenty boxes? - Event comparison
Compare the odds of pairs of events. A) Slovakia will be the world champion in ice hockey 2 times in a row. B) You will write all the papers this year with at least a double. C) In two years, humans will be on Mars. D) Someone in your class will write all - Type of triangle
How do you determine the type of triangle if the angle ratio is 2:3:7? - Mirror
How far must Paul place a mirror to see the top of the tower 12 m high? The height of Paul's eyes above the horizontal plane is 160 cm, and Paul is from the tower distance of 20 m. - Cuboid walls
Calculate the cuboid volume if its different walls have an area of 195cm², 135cm², and 117cm². - Three-digit numbers
How many can you create three-digit numbers from the numbers 1,3,5,7 if we must not repeat the numbers? - Calculate the pool
Calculate how many square metres of lining are needed for a pool 6 m long, 4 m wide, and 1.5 m deep. Add 10% for waste. - Tank diameter
The cylinder tank is 8 meters long and contains 40 cubic meters of petrol. What is its inside diameter? - Similarity coefficient
The triangles ABC and A'B'C' are similar to the similarity coefficient 2. The sizes of the angles of the triangle ABC are α = 35° and β = 48°. Find the magnitudes of all angles of triangle A'B'C'. - Average speed 4
Starting at home, Tony traveled uphill to the store for 45 minutes at 8 miles per hour. he then traveled back home on the same path at a speed of 24 miles per hour. What is his average speed for the entire trip? - Clocks The length of the minute hand is 12 cm. What track in meters will its endpoint describe in a week?
- Cuboid height
What is the cuboid's height if its base edges are 15 cm and 4 cm long and its volume is 420 cm³? - Rectangle sides
The rectangle's width is 20 percent shorter than its length. Its perimeter is 22 cm. What are the dimensions of the rectangle?
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