Math practice for 13 year olds - page 279 of 420
Number of problems found: 8399
- Sunflower Seeds Eating
Jane and Dana had a total of 125 sunflower seeds. When eating, Jane was smarter and ate 13 more seeds. They gave the last 6 seeds to the parrot. How many seeds did Jane eat, and how many did Dan eat? - Three 43
Three brothers inherited a cash amount of 62,000 and divided it among themselves in the ratio of 5:4:1. How much more is the largest share than the smallest share? - Roof cover
Above the pavilion with a square ground plan with a side length of a = 12 m is a pyramid-shaped roof with a height v = 4.5 m. Calculate how much m² of sheet metal is needed to cover this roof; if 5.5% of the sheet, we must add for joints and waste. - Simple right triangle
Right triangle. Given: side c = 18.8 and angle beta = 22° 23'. Calculate sides a, b, angle alpha, and area. - Alpha angle
Right triangle. Given: side c = 15.8 and angle alpha = 73°10'. Calculate side a, b, angle beta, and an area. - Cyclist meeting
Martha will leave Včelná on a bicycle at 12 km/h. From Holešovice, which is 32 km from the village of Včelná, at the same moment, Eve will drive towards it at a speed of 18 km/h. How long and where will they meet? - Surface area 6
Find the surface area of a prism whose bases are right triangles with sides of length 3, 4, and 5 inches and a height of 8 inches. Include a sketch - Triangle calculations
Right triangle. Given: side b = 15.8 angle alpha = 15° 11`. Calculate the side a, c, beta angle, and area. - Cube Surface from Section
The cube A B C D A'B'C'D 'has a section area ACC'A' equal to 64 square root of 2 cm². Calculate the surface of the cube. - Cube cut The cube ABCDA'B'C'D ' has an edge of 12 cm. Calculate the area of diagonal cut B DD'B '.
- Divide
Divide the area of rectangles with dimensions of 32 m and 10 m by the ratio of 7:9. What area corresponds to a smaller section? - Body diagonal - cube
Calculate the surface and cube volume with a body diagonal 15 cm long. - Cube Edge Volume Change
How does the volume of a cube change if we double the length of its edge? - Cuboid Height from Surface
The cuboid with a base measuring 17 cm and 13 cm has a surface of 1342 cm². Calculate the height of the cuboid and sketch its network. - Three-fifths
Three-fifths of the school's students are girls. What percentage are boys? - Fence posts
Mr. John's plot of land has dimensions of 252 dm and 28 m. How far apart must he place the fence posts so they are the same distance on both sides? How many will he need to fence the entire property? - Water flow 2
How many liters of water will flow in 7 minutes from a cylindrical pipe 1 cm in diameter if the water flows at a speed of 30 km per hour? - TV Diagonal Length
Calculate the diagonal length of the 87 cm and 60 cm TVs and round the result to units. - Production Percentage Increase
The new line-producing screws did not work at total capacity from the beginning. On Monday, she produced 20% of the daily norm. On Tuesday, she already met 4/5 of the daily norm. By what percentage was the number of screws made on Tuesday higher than on M - Number percentage increase
The number x = 2 / p² is given. Calculate a number 400% greater than x if p = 10.
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