Math practice for 13 year olds - page 156 of 414
Number of problems found: 8280
- Wall paint proportional
Matthew paints his room. He paints square walls. He painted a wall with a side of 3 m and consumed 5 kg of paint. How many kilograms of paint will he need on a wall with a side length of 6 m? - Part-timers
Six part-timers would take seven hours to pick strawberries. How long would this work take if two more temporary workers were added after three hours? - Four-times of an age
Charles's age is two-fifths the age of his older brother Michael. Two years ago, Charles was four times younger than Michael. How old is Charles now? - Rectangular land
Due to the new road, the longer dimension of the rectangular plot had to be shortened by 4 percent, and the shorter dimension shrunk by 10 percent. Thus, the area of the land has decreased by how much percent? - Feed to hay
How many tons of water do we have to dehydrate from 8 tons of feed if the original moisture is 54 percent to get hay with a moisture content of 15 percent? Round to two decimal places. - Length of the chord
Calculate the length of the chord in a circle with a radius of 25 cm and a central angle of 26°. - A rectangle 5
A rectangle has sides of 10 cm and 14 cm. Calculate the angle between a diagonal and a long side. - The conical roof
The conical roof above the warehouse has a diameter of the lower part (base) d = 11.2 m and a height v = 3.3 m. How many rectangular steel plates with dimensions of 1.4 m and 0.9 m were needed to produce this roof if the seams and waste required an increa - Magda's money
Magda had 300 Kč (Czech crown). With her friend Lenka she went to the cinema on Wednesday, the tickets cost altogether 258 Kč. In the cinema she bought popcorn for 49 Kč. Lenka paid her own ticket and gave her another twenty-crown coin for popcorn. On Thu - Pocket money debt
Mark had 325 CZK. He bought a T-shirt for 129 CZK and wanted to spend 276 CZK on fishing supplies. How many CZK did his parents add to his fishing gear? How many weeks did they cut his pocket money by CZK 10 before he paid off the debt? - Yogurt plan exceeded
The dairy produced 2,800 pieces of yogurt instead of 2000. By what percentage did it exceed the plan? - Student sibling percentage
There are 30 students in the class. 70% of them have one sibling. How many students have one sibling? - Car repair parts
Car repairs cost CZK 8,400. The owner paid 36% for labour and the rest for new parts. How much did he pay for the new parts? - Book price
The book was increased by CZK 20% from CZK 350. The bookseller subsequently reduced it by 15% as it did not go on sale. What was its final price? - Club boy girl There were 43 pupils in the school club, seven fewer boys than the girls. How many boys and girls were in the club?
- Volunteer hours average
During the cross-country ski run modifications, 32 volunteers worked 256 hours. How many hours did an average volunteer work? - Wire bundle weight
How many meters of wire is in a bundle of 900 g if 10 meters of wire weighs 150 g? - Paper cutting
Susanna is cutting construction paper into rectangles for a project. She needs to cut one rectangle 10 inches × 14 1/2 inches. She needs to cut another rectangle 10 1/3 inches by 10 1/2 inches. How many total square inches of construction paper does Susan - Select
Select the statement that describes this expression: 5 x (3 + 4) - 4. a) 5 times the sum of 3 and 4, then subtract 4 b) 5 times 3 plus 4 minus 4 c) 5 more than the sum of 3 and 4, and then subtract 4 d) 5 times 3 plus the difference of 3 and 4 What is the - School model
The beech school model of a regular quadrilateral pyramid has a base 20 cm long and 24 cm high. Calculate a) the surface of the pyramid in square decimeters, b) the mass of the pyramid in kilograms if the density of the beech is ρ = 0,8 g/cm³
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