Maths practice for 12-year-olds - page 103 of 353
Number of problems found: 7043
- Quadrilateral ABCD
Construct a quadrilateral ABCD if AB = 10 cm, AD = 6 cm, DC = 6.5 cm and angle BCD = 90 degrees. - Diamond area perimeter
What is the area and circumference of a diamond whose diagonals are 7 dm, 12 dm in length, and 6 dm in height? - Stool cover fabric
Susan has an old stool shaped like a cube with an edge length of 80 cm. She wants to sew a new cover for it. How many square metres of fabric does she need, allowing an extra 15% for stitching and folds? - Number divisibility replacement
Which number should replace the letter X so that the number 7618X is divisible by three and four? - Number divisor sum Calculate the sum of all divisors of the number 70.
- Sauna wood paneling
In the basement, they have a cube-shaped room with an edge length of 2.5 m, which has no windows, only a door with dimensions of 2*1 m. They decided to make a Finnish sauna in it. How many square meters of wood paneling will they need? - Parking car capacity
The department store has a rectangular car park with a length of 48 m and a width of 65 dm. How many cars can there fit when each car needs 2.5 m²? - A rectangular prism
A gift box in the shape of a rectangular prism measures 8 by 10 inches. What is the least amount of wrapping paper needed to wrap the gift box? Explain. What is the surface area of the gift box? - Number fraction puzzle
Find a number whose two-thirds are two less than its three-quarters. - Adeline
Adeline helped her mother make 7/9 liters of lemonade to treat their guests. She poured the lemonade into cups. Each cup had a capacity of 1/6 liters. She filled some cups entirely except for 1 cup. How much was lemonade in the cup that was not filled? - Beef price kilogram
A package of beef bought in the store was labelled: 0.520 kg, price 64 CZK. How many crowns does 1 kg of this type of meat cost? - Measuring gold
Gold's density is 19200 kg/m³. How much does a gold bar weigh 25 cm, 8 cm, and 37 mm? - Block height surface
A cuboid with a square base of edge length 4 dm has a surface area of 112 dm². Find its height. - Different balls
There are 180 balls in three different colors in the bag. What is the smallest number of marbles to be selected so that there are at least 3 of the same color among them if the marble of the same color is the same in all three colors? - Athlete cyclist finish
The athlete ran on a 10 km route at a speed of 5 m/s, 10 minutes after him. A cyclist drove at a speed of 30 km/h. Who will be at the finish first (A or B)? - Five-digit number creation
List all five-digit numbers in ascending order that can be formed using the digits three, four, and two zeros. - Strawberries - pulp
Marta and Alice bought their children strawberries. They ate most of them, each making pulp from the remaining strawberries. Marta filled her entire cube-shaped container with dimensions 5.2 cm, 1 dm, and 8.3 cm; Alice had a cube-shaped container with an - Precipitation - milimeters
The total precipitation for one day reached 22 mm. How many hectoliters of water have rained on a rectangular garden measuring 32 m and 45 m? - Ice cube weight
The sculptor composes an ice city from ice cubes. The cube with an edge length of 2 dm weighs 7.2 kg. How many kilograms is an ice cube with an edge length of 6 dm heavier than it? - Vase water capacity
The cube-shaped vase contains 320 ml of water and reaches a height of 5 CM. How many milliliters of water can we pour into the vase so the water does not run out?
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