Math practice for 13 year olds - page 252 of 415
Number of problems found: 8281
- Trip to a city
Lin wants to save $75 for a trip to the city. If she has saved $37.50 so far, what percentage of her goal has she saved? What percentage remains? - Parallelogram
Rhomboid (parallelogram) has a longer side of 50 cm long. The size of its one height is four times the size of its second height. Calculate the length of the shorter side of this rhomboid in centimeters. - Octagonal tank
The tank has the shape of a regular octagonal prism without an upper base. The base edge has a = 3 m, and the side edge b = 6 m. How much metal sheet is needed to build the tank? Do not think about losses or sheet thickness. - Tourist average speed
A tourist moving at the same pace completes a 21-kilometer hike in 4 hours, taking a 30-minute break. Calculate the average speed of tourists. - Three Consecutive Natural Numbers
Determine the sum of three consecutive natural numbers such that the sum of the first and third numbers is 368. - Number series sum The difference between every two adjacent numbers equals three in a series of four numbers. The sum of these numbers is 60. Specify these numbers.
- Feet to miles
A student runs 2640 feet. If the student runs an additional 7920 feet, how many total miles does the student run? - KLMN trapezoid
The KLMN trapezoid has bases KL 40 cm and MN 16 cm. On the KL base is point P. The segment NP divides the trapezoid into units with the same area. What is the distance of point P from point K? - Cutting paper
Divide a rectangular paper with dimensions 220 mm and 308 mm into squares of the same size so that they are as large as possible. Specify the length of the side of the square. - Land
A rectangular, triangular piece of land has an area of 30 square meters and a 12 meter-long leg. How many meters of fence do you need to fence this piece of land? - London trip spending
On a trip to London, Julie spent one-third of the pounds on the first day, two-thirds of the rest on the second day, and 14 pounds on the last day. How many pounds did Julia have on the trip? - Non-skiers
All fifth-graders went together on a ski course. There were more than 30 but fewer than 40 of them. First they were divided into skiers and non-skiers. Half of all the girls ended up in the non-skiers group, along with the same number of boys. In the skie - Pole painting calculation
The gardener used 18 poles with a base of 15.15 cm and a height of 150 centimeters to fence the plot. Calculate how much paint he will need to paint the columns twice. One kilogram of paint covers eight square meters. - Find diagonal
Find the diagonal length of a cuboid with length=20 m, width=25 m, and height=150 m. - Volume of ball
Find the volume of a volleyball with a radius of 4 1/2 decimeters. Use 22/7 for π - The volume 2
The volume of a cube is 27 cubic meters. Find the height of the cube. - On a farm
A farm has 900 rabbits, 700 sheep, 300 cattle, and 500 pigs. What percentage of the total number of animals are rabbits? - Two friends
Peter can do all his work himself in 6 hours, while Martin can do the same work himself in 8 hours. Peter worked first and was then replaced by Martin, so the whole work was done in 6.5 hours. Calculate how long Peter worked before being replaced by Marti - Dental check class
Class 7B is having a preventive dental check-up. Two dental caries were found in a quarter of the pupils and one caries in an eighth. Half of the class had all their teeth healthy. How many pupils go to class 7B if three pupils are absent on the day of th - Sugar production
From 1 ton of beet, 150 kg of sugar is produced. 450 kg of lime is consumed to clean 1 ton of sugar. Calculate how many kgs of lime are consumed when processing 1 ton of sugar beet.
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