Maths practice for 12-year-olds - page 205 of 355

Number of problems found: 7083

Athletic club
All athletic club boys lined up by size. In front of Peter was one-eighth of the total. Right behind Peter stood his brother Radek and behind Radek, another five-sixths of the total number of boys. Mark the unknown total number of athletic club boys x. 1,
Cheese kilogram cost
20 dkg of cheese costs 40 CZK. How much does 1 kg of cheese cost?
Cup milk filling
How many cups with a volume of 2.5 deciliters will you fill from 1 liter of milk?
Grandfather pond time
Grandfather left the house on his bicycle at 1 p.m. He drove to the pond and returned home at 3:20 p.m. There and back, he rode the same road across the plain. He stayed at the pond for 1 hour. How many minutes did it take him to get to the pond?
Reserve map scale
The nature reserve covers an area of 40,000 square kilometers. If we draw it on a map on a scale of 1:1000000, we get a square. Find the side of the square on the map.
Interesting equation solving
Solve an interesting equation: (1 * x) + (2 * x) + (3 * x) + (4 * x) + (5 * x) + (6 * x) = 100
Two parts journey
The driver of the car plans to drive 30 km in 0.5 hours. For 20 minutes he follows the convoy (traffic jam) at a speed of 30 km/h. What speed would he have to go in the remaining time?
Steel tube
The steel tube has an inner diameter of 4 cm and an outer diameter of 4.8 cm. The density of the steel is 7800 kg/m³. Calculate its length if it weighs 15 kg.
School pupil distribution
Forty-eight pupils go to school; there are ten boys more than girls. How many girls go to school?
Bicycle pursuit calculation
The first patrol of the pupils' orientation run started at 8 a.m. at an average speed of 5 km/h. At 8:36 AM, the leader of the orienteering race followed them on a bicycle at a speed of 20 km/h. When and how far from the start will he catch up with them?
Sales off
After discounting 40%, the goods cost 15 €. How much did the cost of the goods cost before the discount?
Car distance calculation
The car's speedometer showed a constant speed of 60 km/h for 5 minutes. What path did the car cover during this time?
Diamond area calculation
Calculate a diamond's area with a circumference of 51.2 cm and a height of 9.6 cm.
Garden scale area
The garden has an area of 5000 m². What is its image area on a 1:1000 scale on the plan?
Carrot apple cost
Mom bought 4kg of carrots for 1 euro 30 cents and 3 kilograms of apples for 2 euro 10 cents. How much did she pay for carrots and apples?
Three-quarters of its volume
The pool is a block shape with a length of 8m, a width of 5.3m, and a depth of 1.5m. If it is filled to three-quarters of its volume, how many hectoliters of water are in it?
Car speed compliance
Police found that the car had traveled 300m in 20 seconds. He complied with the driver's maximum allowed speed of 50 km/h
Proportion 3
For every eight mango trees in the orchard, there are 4-star apple trees. If there are 1320 trees, how many trees of each kind are there?
Plot dimension calculation
The rectangular plot has dimensions of 48 mm and 72 mm on the plan on a scale of 1:5000. Calculate its dimensions and give the results in meters.
Eq-frac
Solve the following equation with fractions: h + 1/3 =5/3

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