Maths practice for 12-year-olds - page 274 of 362
Number of problems found: 7228
- Remaining 4448
3/4 of the class went skiing. Of those who stayed home, 1/3 fell ill, and the remaining 6 were at a math camp. How many students does the class have? - The machine
The machine was in operation for nine-tenths (in a fraction) of eight hours of working time. How long has he been running? - Subjects
The student makes a mathematical task for five minutes and the task from biology in twelve minutes. On another day, he has homework in math and biology, which consists of eleven tasks together. To do the job took an hour and a half. How many tasks are mad - Evaluate expression
Evaluate expression using the BODMAS rule: 1 1/4+1 1/5÷3/5-5/8 - Smallest 4432
What is the smallest number of members of a dance group with the same number of guys and girls, and at the same time they can form groups of three or five dancers while dancing? - Volume of an apple
How many apples will fit in a box measuring 20 cm × 50 cm × 25 cm? - Circumference 4430
There is an isosceles triangle with a circumference of 36 cm, and the height at the base is 12 cm long. Calculate the length of the arm of a given triangle.
- Resulting 4429
What will be the resulting volume V, if we mix liquids with volumes of 3hl and 200 cubic dm A) V = 0.32 cubic meters B) V = 0.50 m cubic C) V = 23hl D) V = 5m cubic - What scale
What scale is the map drawn if it shows a 15km route from the station to the ruins with a line 30cm long? A) 1:2000 B) 1:5000 C) 1:20,000 D) 1:50,000 - Value 4423
Find the value of x: x-4 / 3x-5 = x + 3 / 10-6x - Circumference 4421
The area of an equilateral triangle is 81 times three below the square root of cm². Calculate its circumference. - Circumference 4420
In an isosceles triangle with a circumference of 36 cm, the height at the base is 12 cm. Calculate the length of the arm of a given triangle. - Relationship - radius
Calculate the volume of the cylinder if the radius of the base is 3 cm, and the relationship between the radius of the base and the height of the cylinder is v = 3r - The cast
The cast in the body of a regular quadrilateral pyramid with a base edge 60 cm long and 5 cm high is made of a material with a density of 7.8 g/cm cubic. Calculate its weight. - Simultaneously 4412
While hunting, the dog sees a hare in the bushes 20 meters ahead. The hare starts running, and the dog starts chasing it simultaneously. A hare runs at a speed of 39 km/h, and a dog at 45 km/h. In how many seconds does the dog catch up with the hare?
- Cylinder-shaped 4411
A cylinder-shaped hole with a diameter of 12 cm is drilled into a block of height 50 cm with a square base with an edge length of 20 cm. The axis of this opening passes through the center of the base of the cuboid. Calculate the volume and surface area of - Ice and water
We want to cover a rectangular rink with dimensions of 55 m and 25 m with a 4cm thick layer of ice. How many liters of water do we need if freezing water increases its volume by 10%? - Centimeters 4404
Calculate the diagonal of a square if its area is equal to 169 square centimeters. - Performance 4403
During a public performance, majorettes line up in three-step, four-step, six-step, and eight-step. All rows are full with each grouping, and no majorette is promoted. Determine the smallest possible number of majorettes for which a performance can be mad - Rectangular 4402
Our task is to save the rectangular images with dimensions of 105 mm and 42 mm so that we cover the smallest square. What will be its size, and how many pictures do we need?
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