Maths practice for 11-year-olds. - page 17 of 224

Number of problems found: 4468

Iron rod
What is the mass of a cylindrical iron rod with a length a = 9 m and a diameter d = 6 cm? The density of iron is 7,800 kg/m³. Express the result in kilograms, and round to the nearest whole number.
On a bicycle 5
Klára left Hořické náměstí on her bicycle and rode to Hradec Králové at an average speed of 20 km/h. Jenda left the same square on his bicycle 15 minutes after Klára left and moved in the same direction as Klára at an average speed of 30 km/h. How long di
A quarter of a gram
How much is three-quarters of 200 grams?
Cyclist 30
A cyclist covered a distance of 18 km in 32 minutes at a constant speed. What distance in kilometers would he have covered at the same speed in 80 minutes?
Books 4
A student read 30 pages in 6 days. He read 75 pages in x days. Calculate x.
Express the unknown
Calculate the unknown from the formula p=F: S Express the unknown F
Teeth
An adult has a total of 32 permanent teeth. How many of them are molars if 1/4 of the teeth are incisors, another quarter are molars and the remaining quarter are canines?
Fuel and oil ratio 2T
Add 4 liters of gasoline with oil in a ratio of 33:1. How much oil is needed?
Evaluate expression
Evaluate the expression written in words: -1 and two/7 + parenthesis -2 and one/4 end of parenthesis + 1/two =
Average 110
The average of five numbers is 1.3 their sum is? The arithmetic mean of the numbers 0.04; 0.014; 0.21 is? The arithmetic mean of four decimal numbers is 2.5. Three of these numbers are 1.8; 0.65; 3.1 the fourth number is?
Buses 7
Two lines leave the bus stop according to the schedule A) 8:00 every 6 minutes until 23:00h B) 8:00 every 14 minutes until 23:00h How many times will buses of both lines leave the bus stop simultaneously between 8:01 and 20:00?
Unknown fraction
2/6 + fraction = 1
Cinema visitors
There are 35 seats in each row of an open-air cinema. Determine the maximum number of visitors that can fit in the viewing area, if we know that there are more than 705 and less than 740.
Concert organizers
800 people came to the concert, a quarter more than the organizers expected. How many people did the organizers expect?
Children - dividing
What is the least amount of nuts we need to have to divide them among 10, 12, and 18 children?
Quarter 84177
We used one-quarter of the coal we bought, leaving us with 12 q. How much coal did we buy?
Animals - pasture
There are a total of 195 animals on the pasture - sheep, goats, calves. There are half as many sheep as goats and twice as many calves. How many sheep are there on the pasture?
Cutting a cuboid
A cuboid can be cut into 200 cubes, each with a volume of 8 dm cubic. Calculate how many cubes with a volume of 1 cm cubic can this cuboid be cut into without a remainder.
Arithmetic 84171
The arithmetic mean of two numbers is 10. One of the numbers is 2. What is the second number?
TEV physical education
The students lined up in threes in a physical education class, then in fours, and there was always one extra student. What is the least number of students that could be in the gym?

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