Maths practice for 12-year-olds - page 105 of 355
Number of problems found: 7081
- Children room plan
An architect has two plans for the same apartment at different scales. On the first plan, at a scale of 1:20, the length of the children's room is 20 cm. What is the children's room size on the second plan, on a scale of 1:50? - Evaulate
Evaluate the following expression with natural numbers: 1÷(52×(2×(135−25)−1)) - Ski savings fraction
Adam is saving for new skis. In August, he saved two-sevenths of the total price, in September one-eighth of the total price, and in October two-thirds of the missing amount. Express as a fraction how much he still has left to save from the price of the s - Sphere cut area
We cut a sphere with a diameter of 10 dm into two equal parts. Calculate the area of the cut. - Track suits
There are 100 tracksuits in a box. The sports shop sold 3/10 of the tracksuits on Monday, 1/4 on Tuesday, and they sold 2/5 on Wednesday, and the rest on Thursday. 1. How many tracksuits did the shop sell on Thursday? 2. What fraction of the tracksuits di - Cyclist stage speed
In the first stage, the cyclist covered 70 km at a speed of 22.1 km/h. In the second stage, he covered 40 km (a total of 110 km), and his average speed increased to 22.9 km/h. What an average speed he developed in the second stage! - Aquarium - water
The aquarium is 5 dm long and 4 dm wide and contains 60 liters of water. A) calculate the height of the aquarium if the water reaches 5 cm below the edge B) calculate the total volume of the aquarium - Cuboid - block
The base of the block is a square with an area of 16 cm². The surface of the block is 128 cm². You calculate the volume of the block in cm³. - Quadrangular block The surface of the quadrangular block is 3.4 dm². The edges of the block are 8 cm and 10 cm long. Calculate the volume of the block.
- Plate grid box
We must draw a square grid on a rectangular plate measuring 154 cm and 210 cm. What should be the side length of the largest possible box? How many fields will be on the board? - Scout brigade total
A group of scouts works in the woods. A third of them cleaned the stream. A quarter collected timber, and the remaining ten planted trees. How many scouts were on the brigade? - Coal dome days
There are 12,000 tons of coal on the first dome and 2,200 tons on the second. They take 80 tons from the first kick every day and 60 tons from the second. How many days will the same amount of coal be on both kicks? - Linden shadow height
The length of the linden shadow is 429 cm. The length of the shadow meter is 78cm. Calculate the height of the linden. - Trash volume estimate
In physics class, students estimated the volume of the trash can in the classroom. There is a record of the answers of 20 pupils on the board. The actual volume of this dustbin was 12 liters. By how many liters does the average student estimate differ fro - Trapezoid triangle area
In the triangle, ABC, X, and Y are the centers of the sides BC and CA, respectively. The ABXY trapezoid has an area of 12. Calculate the area of triangle ABC. - Unary operators
Calculate: --- (- 5) + (- (- 3)). - Machine product hours
The machine will produce 5,600 products in 7 hours. How many products will they make in 8 hours? - Bathtub
There were 6 gallons of water in Mia's bathtub. Then, 0.1 gallons drained out. How much water is left in the bathtub? - Dining room lineup
If the boys let the two girls in front of them, how many different ways can Anka, Betka, Cyril, Daniel, and Erik line up in the dining room? - Two-digit number creation
How many natural two-digit numbers can we form from the digits 0, 1, 2, and 3 if the numerals cannot be repeated in these numbers?
Do you have unsolved math question and you need help? Ask a question, and we will try to solve it. We solve math question.
