Math practice for 13 year olds - page 192 of 415
Number of problems found: 8281
- Cube dimension calculation
The cube has an area of 486 dm². Calculate the length of its side, its volume, the length of the body, and wall diagonals. - Calculate a prism
Calculate the volume and surface area of a prism whose height is 16 cm and whose base is a right triangle with sides of 5 cm and 12 cm and a hypotenuse of 13 cm. - Pool pump calculation
The pool for swimmers has dimensions of 25 m, 10 m, and 2.8 m, and the children's pool is only 10 m, 4 m, and 1 m. The pump will change all the water in the swimming pool in 9 hours. How long does it take for the same pump to pump out the water in the chi - Train distance calculation
Two trains left London bound for Brighton. One at 14:00 and the other at 14:20. One train moves at a speed of 120/km per hour. Kinds 150/km per hour. How far apart will they be at three o'clock? - Isosceles triangle
An isosceles triangle has an angle against the base that measures 55°. What is the size of the angle at the base of an isosceles triangle? (Calculation and procedure) - Regular quadrilateral pyramid
Find the surface area of a regular quadrilateral pyramid with a volume of 24 dm³ and a height of 45 cm. - Six painters
Six painters paint an area of 120 m² in 4 hours. How long does it take for 12 painters to paint 480 m² with the same performance? - Percentage calculation examples
Calculate these four examples as percentages: 5% of 650 meters 30% of 18 kg 351% if 9% is 1/3 62.5% if 15% is 0.75 - Antenna mast
An antenna mast is 26 metres high. It is secured by four steel cables attached 1.6 metres below the highest point of the mast and anchored to the ground at the vertices of a square with a side length of 14 metres. The mast stands at the centre of this squ - Father daughter age
When the father was 31, the daughter was eight years old. Now, a father is twice as old as a daughter. How old is her daughter? - Surface of the cuboid
Find the surface of the cuboid if its edges have the dimensions a, 2/3a, and 2a. - Pond radius calculation
Mr. Mark wants to build a circular pond in his garden. He wishes the perimeter of the pond in meters and the area in square meters to be expressed in the same numbers. What is the radius of the pond? - A cliff
A line from the top of a cliff to the ground passes just over the top of a pole 5 ft high. It meets the ground at a point 8 ft from the base of the pole. The point is 93 ft from the base of the cliff. How high is the cliff? - Sugar beet yield
Express the yield per hectare of sugar beet when you know that we can harvest 20 tons of sugar from 20 hectares of fields. - Prism surface calculation
Calculate the surface of a regular 5-sided prism with a base area of 60 dm² if the length of the edge of the lower base is four dm. The height of the prism is 1.3 m. - Bottle filling calculation
We filled 90 liters of must into bottles, some with a volume of 1 liter and some with a volume of 1.5 liters. Thus, we have a total of 70 bottles of must. How many bottles of each species did we fill? - Book reading
Susan thought, "If I read 15 pages a day, I will read the whole book in 8 days. "How many pages would she have to read a day if she wanted to finish the book on the 6th day from the start of reading? And how many pages does the book have? - Mr. Ben
Mr. Ben drives bricks to the construction site. If he drove three times a day, he would make bricks in 8 days. How many times a day would he goes every day to be done two days earlier? - Typist page calculation
The typist typed 16 pages of text in 2 hours and 8 minutes. How many pages of text will you write at the same speed in 20 minutes? - Everyone drinks the same
Twenty-four bricklayers drink 72 bottles of beverages per day at a construction site. How many bottles would 19 bricklayers need? Assume everyone drinks the same amount.
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