Math practice for 13 year olds - page 153 of 428
Number of problems found: 8555
- 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 repair costs CZK 8,400. The owner paid 36% for the work and gave the rest for new parts. How much did he give for 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 - Parallelogram ABCD
We have the parallelogram ABCD, where AB is 6.2 cm; BC is 5.4 cm and AC is 4.8 cm. Calculate the height on the AB side and the angle DAB. - Pants shirt combinations
He has four types of pants. How many T-shirts does he have if he can dress 40 different ways? - The rectangular
The rectangular trapezoid has bases 15 dm and 8 dm long, and the length of the inclined arm is 12 dm. How long is the other arm of the trapezoid? - Safe wall percentage
The safe is 100 cm high, 80 cm wide, and 60 cm deep. Its internal space has a volume of 168 liters. What percentage of the total volume of the safe is occupied by the walls of the safe? - Ball diameter density
What is the diameter of the ball (for men) if it weighs 7,250 g and ρ = 7.8g / cm³ - Six identical
Six identical compressors inflate 180 balloons in one hour. How many balloons inflate one compressor in 10 minutes? - Water cylinder
Zuzana poured 785 ml of water into a measuring cylinder with a base radius of 5 cm. The water in the cylinder reached a height of 2 cm from the upper edge. How tall is the cylinder? (π = 3.14) - Block wall diagonal
A block with dimensions a = 15cm b = 5cm and a block height c = 8cm. Calculate the length of the wall diagonal in the base. - Calculate v,V
A) Calculate the speed from the path calculation formula. B) From the formula for calculating the volume of the cone, express the radius r. - Function table graph
Calculate and write in the table 10 values of the function f: y = 3x + 1, and the function's graph from them. - Arrange
Arrange the following in descending order: 0.32, 2on5, 27%, 1 on 3
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