Maths practice for 12-year-olds - page 202 of 347

Number of problems found: 6930

Wooden container
The locksmith should cover the cube-shaped wooden container with a metal sheet inside. The outer edge of the container is 54cm. The wall thickness is 25 mm. The container has no lid. Calculate. How many sheets will be needed to cover it?
Chauncey
Chauncey is building a storage bench for his son's playroom. The storage bench will fit into the corner and against two walls to form a triangle. Chauncy wants to buy a triangular-shaped cover for the bench. Suppose the storage bench is 2 1/2 ft along one
Fraction + eq
Solve following simple equation with fractions: -5/6(8+5b) = 75 + 5/3b
Divide
Divide 72 by 7:2, calculate the ratio of the numbers found in this order, and write it down as a decimal.
The glass
1 m³ of glass weighs 2600 kg. Calculate the weight of the glass glazing panel with dimensions of 2.5 m and 3.8 m if the thickness of the glass is 0.8 cm.
Cylinder painting cost
How many kg of paint do we need to paint a cylinder with a diameter of 60 cm and a length of 2 meters if we use 0.5 kg of color for one square meter of surface? How much will we pay for paint if 1 kg costs CZK 165?
Play tennis
Peter and George agreed to go play tennis. Peter's path to the tennis court is 800 meters longer and leads around George's house. Peter comes out first and then picks up George. Together they go at the same average speed as Peter went, so they reach the p
Student sport participation
Of 34 pupils, 17 skis and 21 skates, 12 practice both sports. a) how many students from the class ski or skate? b) how many students from the class ski but do not skate? c) how many students from the class do not skate or ski?
Flower bed
The park has a rectangular flower bed with dimensions of 3.2 m and 1.5 m. How many rose bushes will we plant in the flower bed if 20 dm² are needed for one bush?
Age question
Jano is three times older than Zdeno. Zdeno is 12 years younger than Janko. How old is Jano, and how old is Zdeno?
RPM
An electric motor makes 3,000 revolutions per minute. How many degrees does it rotate in one second?
Cheese kilogram cost
20 dkg of cheese costs 40 CZK. How much does 1 kg of cheese cost?
Cup milk filling
How many cups with a volume of 2.5 deciliters will you fill from 1 liter of milk?
Grandfather pond time
Grandfather left the house on his bicycle at 1 p.m. He drove to the pond and returned home at 3:20 p.m. There and back, he rode the same road across the plain. He stayed at the pond for 1 hour. How many minutes did it take him to get to the pond?
Reserve map scale
The nature reserve covers an area of 40,000 square kilometers. If we draw it on a map on a scale of 1:1000000, we get a square. Find the side of the square on the map.
Interesting equation solving
Solve an interesting equation: (1 * x) + (2 * x) + (3 * x) + (4 * x) + (5 * x) + (6 * x) = 100
Two parts journey
The driver of the car plans to drive 30 km in 0.5 hours. For 20 minutes he follows the convoy (traffic jam) at a speed of 30 km/h. What speed would he have to go in the remaining time?
Steel tube
The steel tube has an inner diameter of 4 cm and an outer diameter of 4.8 cm. The density of the steel is 7800 kg/m³. Calculate its length if it weighs 15 kg.
Bicycle pursuit calculation
The first patrol of the pupils' orientation run started at 8 a.m. at an average speed of 5 km/h. At 8:36 AM, the leader of the orienteering race followed them on a bicycle at a speed of 20 km/h. When and how far from the start will he catch up with them?
Car distance calculation
The car's speedometer showed a constant speed of 60 km/h for 5 minutes. What path did the car cover during this time?

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