Maths practice for 12-year-olds - page 51 of 355

Number of problems found: 7081

Following bike
At 8:00 a.m., my son rode a bicycle at a speed of 18 km/h. at 8:20 a.m., his father followed him at a speed of 60 km/h. How long will it take for Dad to arrive?
Purchase - owners
The house is divided between the owners in shares of 1/8, 1/12, 1/6, 1/8, 1/4, and 1/4. Except for one with a 1/4 share, they decide to sell their shares. How will he divide the purchase price of CZK 12960000?
Finishing Tasks Earlier
Nine-year-old Lucia is preparing for testing. He solves a collection of 40 tasks per day. He will need 9 days to solve all the tasks. How many days earlier would she finish if she solved 60 tasks a day?
Trajectory
Nelka holds a dumbbell in her hand at arm's length. Then she lifts it by bending her arm only at the elbow, making an angle of 135°. The exercise ends with the dumbbell lowering along the same path. What is the length of the trajectory the dumbbell follow
Paint for Pool Perimeter
The swimming pool is 25 m x 12 m. The safety coating around the perimeter needs to be restored. One can of paint is enough to paint 15 m. How many cans of paint should be bought? One can cost 300 Sk. How much SK will we pay for the paint?
Deciliters - balls
We placed 10 layers of 100 balls with a diameter of 1 cm in a cube-shaped aquarium with an inner edge length of 10 cm. How many deciliters of water could still fit in the aquarium?
Egg Laying Rate
One and a half hens laid one and a half eggs in a day and a half. How much will six hens lay in seven days?
Protectors
The nature protectors have pledged to clean the part of the stream that belongs to their municipality. On Saturday, they cleaned one quarter of the length of the entire stream, and on Sunday, 1.5 km, so they cleaned a stream 4 km long over the weekend. Wh
Distance from Wheel Rotation
Škoda Kadjar has a wheel diameter of 65 cm. What path will it travel if it turns 100 times?
Circle arc + section
Calculate the length of the arc of a circle and the volume of a circular section if the circle's radius is 8.3 centimeters and the central angle alpha=104 degrees.
Cylindrical bucket
The cylindrical bucket was filled 2/3 with water. You know that the diameter of the bottom is 25 cm, and the water reaches a height of 24 cm. What is the maximum amount of water that can be poured into the bucket?
Straight and right
What is the arithmetic mean of straight and right angles?
Quadrilateral prism
Calculate shell area of a quadrilateral prism with a rhombus base with dimensions a=6cm, ha=40mm. The height of the prism is 81 mm.
Quadrangle ACEG
The figure shows two rectangles ABCD and DEFG, with |DE|=3 CM, |AD|=6 CM, |DG|= 5, |CD|= 10 CM. Calculate the area of quadrangle ACEG. Figure description: the rectangles have one vertex D in common. Rectangle ABCD has twice as long sides as DEFG. All si
Total Sidewalk Area
The pavers paved 1/8 of the total area of the sidewalk on the first day. On the second day, they paved 20 square meters of pavement. In both two days, they paved 50 square meters of sidewalks. Calculate the total area of the sidewalk.
Weight of Gasoline
The volume of the gasoline bottle is 15 liters. What is the weight of an entire bottle of petrol if the empty one weighs 1 kg? The density of gasoline is approximately 730 kg/m³.
Daughter and Mom
The mother is 38 years old, and the daughter is 16 years old. When was the mother three times as old as her daughter (how many years ago)?
Carpet area
How many meters of carpet 3 meters wide are needed to cover a square floor with a area of 36 square meters?
Fencing a Square Garden
How many meters of mesh is needed to fence a square garden with an area of 5,402.25 square meters?
Triangle Side Calculation
Calculate the side a of triangle ABC if we know va=8cm, b=16cm, vb=10cm.

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