Math practice for 13 year olds - page 348 of 423
Number of problems found: 8457
- Individual 3276
There are 2,600 moldings in stock. They are to be divided into 3 workshops so that in hall 1, there are 400 moldings less than in hall 2, and in hall 2, there are 300 moldings more than in the third hall. How many moldings are delivered to individual hall - Two-tenths 3275
The tourist ride lasted 6 hours. The tourists had three 15-minute and four 10-minute rest breaks during the tour. What % of the total walking time broke? Calculate two-tenths of a place - Determine 3274
Nine cleaners clean 3150 m² of the floor in 7 days. Determine how many m² of floor eight cleaners will clean in 9 days. - Information 3273
One serving of breakfast porridge weighs 175 g. According to its nutritional information, it contains 75 g of fiber. What percentage of fiber is in this porridge? - Three-stage 3272
In the three-stage races, which totaled 550 km, cyclists drove 38% in the first and 27% in the second stages. How many km will they cover in the third stage? - Identify 3271
The sum of the two numbers is 110. The first number is 900% of the second number. Identify both of these numbers. - Apples in baskets
We have eight baskets. The first basket contains four apples, and the next basket contains 29 more apples than the previous one. Find the number of apples in each basket. - Pears
Andrew, Lenka, and Rastro have together 232 pears. Lenka has 28 more than Rastro, and Rastro pears have 96 more than Andrew. Determine how much each of them has pears. - Students
Three students sit in the front row, and 11 students sit in every other row, more than in the previous row. Determine how many students are in the room when the room is nine lines and how many students are in the seventh row. - Harvesters
The first harvester reaps the grain from the land for 24 hours, and the second harvester for 16 hours. How many hours will it take to harvest by two harvesters, but the second harvester started working four hours later than the first? - Flowerbed
The family has tulips on a square flower bed of 6 meters. Later, they added a square terrace with a side of 7 meters to their house. One vertex of the terrace lay exactly in the middle of a tulip bed, and one side of the terrace was divided by the side of - Quadrilateral 3262
Construct a quadrilateral ABCD with dimensions AB, BC, AC, BD, and angle d = CDA. - Engine pulley
The engine has a 1460 rev/min (RPM). The disc diameter is 350 mm. What will be the peripheral disc speed in RPM? Pulleys on the engine have a diameter of 80mm, and a disc has a diameter of 160mm. - Cylinder twice
If the radius of the cylinder increases twice, and the height is reduced twice, then the volume of the cylinder increases (how many times?): - One-quarter 3256
Michaella and Sarah have saved 220 CZK together. They went on a pilgrimage; Michaella took one-quarter of her savings, and Sarah took one-fifth of her savings. Both of them together had 50 CZK for the pilgrimage. How much did Michaella and Sarah save in t - Prism
Calculate the surface area and volume of a prism with a body height h = 10 cm, and its base has the shape of a rhomboid with sides a = 5.8 cm, b = 3 cm, and the distance of its two longer sides is w = 2.4 cm. - Emptied 3252
If two gates are open, the company will empty the pond in 20 days. A larger sluice would empty in 30 days. How many days would he have emptied himself with only a small sluice? - Another 3251
The car drove from Liberec to Olomouc for 5 hours. Another vehicle drove 12 km more in an hour and made the same journey in 4 hours. How far is it from Liberec to Olomouc? - Direction 3250
The bus from Prague to M. Lázně travels at a speed of 36 km/h. At the same time, a car left Mariánské Lázně in the direction of Prague at a speed of 52 km/h. After the 90-minute journey, the two vehicles are still 30 km apart. What is the distance between - Tangerines 3249
The bowl with tangerines weighs 16 kg. When the cook dispenses 2/3 of the tangerines in the school cafeteria, the bowl with the rest of the tangerines weighs only 8 kg. What is the weight of an empty bowl?
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