Maths practice for 12-year-olds - page 47 of 350

Number of problems found: 6995

Visitors
The first holiday weekend, 1250 visitors came to the swimming pool in Zdice. Sunday was not so nice, so two-thirds of the number of visitors who were at the swimming pool on Saturday came. How many visitors were there on Saturday?
Liquid - pouring
We need to pour liquid from two cube-shaped containers into one container. The original containers have edges of 0.7 m and 0.9 m. What will be the edge length of the cube of the common container?
Salesman 4
The salesman sold 3/5 of the potatoes on the first day and 2/3 of the rest on the second day. What fraction of the potatoes did he sell in two days? What fraction of the potatoes did he have left?
Quarter 83940
Half a cake costs 7€ more than a quarter of a cake. How much does a cake cost? Thank you
23 students
The ninth grade students went on a field trip in such a number that they could sit at tables of 4, 5, and 6, and each time one seat remained free. What is the smallest number of students who participated in the field trip?
The denominator
Find unknown denominator in fraction inequality: 6/5>41/_>8/7
Aluminum - density
The density of aluminum is 2,700 kg/m³. Calculate the mass of an aluminum cube with a volume of 80 cm³!
Sifted sand
At a construction site, the sand used in mortar is sifted through a sieve. In the process, 1/6 of the coarse sand falls through. Determine how many cubic meters must be brought in to obtain two cubic meters of sifted sand.
Balls 6
Jane has balls in her bag that could be divided fairly between 4, 5, or 6 children. How many balls at least does Jane have in her bag?
Paving 2
It will take a construction company 8 working days to pave the sidewalks on two streets in a city if all 6 pavers work. However, only 4 pavers can complete the job because the other two have been dismissed. How many working days will it take the group of
Shadow - an observation tower
How tall is the observation tower if it casts a shadow 9.6 m long at exactly the same moment that a half-meter pole casts a shadow 30 cm long?
Box
A paper box is in the shape of a cube. 2,400 cm² of paper was used to make it. Bends for gluing the walls are not included. Calculate the volume of the box.
Rectangle - perimeter, side
From the formula for calculating the perimeter of a rectangle, express the length of side b and find its size for o = 28 cm, a = 7.5 cm.
Fifths 83882
What is two-fifths of 175?
Frames
A framer is to prepare 23 picture frames. The frame will have dimensions of 30 cm and 42 cm. The strips from which he will make the frames are 3 meters long. a) How many frames will he make from one strip? b) How many strips will he need?
Minutes 83870
How many minutes is five-sixths of half an hour?
Multiple 83863
The least common multiple of 2190 and b is 13140. What is b?
Increased 83849
Starka's pension of €345 was increased by 9%. What will her pension be after the increase?
It consumes
A textile machine uses 7/8 meters of fabric to sew shorts. He uses 3/5 meters more fabric to sew a T-shirt. Find out whether 30 meters of fabric will be enough to sew a set of 12 jerseys if one jersey consists of one T-shirt and one pair of shorts.
Classmates 2
Classmates Peter, Vlado, and Michael arrived late to school. Peter was 1/4 hour late, Vlado was 2/8 hours late and Michael was 4/16 hours late. How many minutes late was each of them?

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