Maths practice for 12-year-olds - page 48 of 335
Number of problems found: 6681
- Finding the Second Number
The arithmetic mean of two numbers is 10. One of the numbers is 2. What is the other number? - TEV physical education
Students lined up in rows of three in a physical education class, and then in rows of four, and each time there was exactly one student left over. What is the minimum number of students that could be in the gym? - Boxes of wafers
Wafers measuring 11¾ cm × 4⅖ cm × 1⅔ cm are packed in rectangular boxes measuring 23½ cm × 26⅖ cm × 6⅔ cm. What fraction of the volume of the box does one wafer occupy? - MO Z7 2025
Adela and Susan ate plums. On the first day, Adela ate three quarters of what Susan ate that day. On the second day, Susan ate three halves of what Adela ate that day. Together, they ate 31 plums over the two days, and each girl ate a whole number of plum - Create 2
Create a suitable table and fill in the data: Producing four machines takes a total of 80 hours. Each machine takes the same amount of time to produce. How long does it take to produce 1 machine, 2 machines, and 5 machines? - From tank 2
First, 1/3 was drained from a water tank, then 1/4 of the remainder was drained. There were 20 litres of water left in the tank. How many litres were in the tank at the beginning? - Peter 27
Peter earned twice as much as Jano from his part-time job. Jano earned €50 less than Peter. How much did each of them earn? - Irregular
Calculate the area and perimeter of a garden created from a rectangular plot measuring 10 m by 20 m after cutting off one corner measuring 6 m by 7 m. The removed rectangular section has sides parallel to those of the main plot. Did the perimeter of the r - Thinking unknown n
I am thinking of a number. If I subtract 14 from it and multiply the result by 6, I get 210. What is the number? - Finding Total Journey Length
We have already travelled 2/5 of the journey, which is 6/35 km. How long is the entire journey? - Railing 3
A railing in a museum is filled with 18 glass panels in the shape of parallelograms with a side length of 40 cm and a corresponding height of 65 cm. How many m² of glass were needed to produce these panels? - Students in a Class The ratio of boys to girls in a class is 3:5. How many students are there in the class if there are 15 girls?
- Six horses
How many bags of feed are needed for 6 days for six horses, if 21 bags of feed are needed for 3 days for seven horses? - Brick 5
A brick weighs 7/2 kg and a tile weighs 11/8 kg. The first truck was carrying 900 bricks and the second truck was carrying 2,000 tiles. Which truck was carrying a heavier load, and by how many kg? - Divisible PIN
Mark's mother helped him with his shopping. She wanted to pay by card when collecting the goods in person, but she was not sure what her PIN was. Could her PIN be a number divisible by six? - Grass seed
How many kilograms of grass seed are needed to establish a lawn on a rhombus-shaped plot of land with sides of 55 m and 40 m, if the height to the shorter side is 22 m and 1 kg of seed is sufficient for 40 m²? - Triangles - combinations
How many different triangles with sides of whole centimetres have a perimeter of 12 cm? - Two cubes 3
Two cubes made of plasticine have single-digit integer edge lengths differing by 1 cm. Can a single larger cube with an integer edge length be made from the same total amount of plasticine? - Percent of Number
What percentage is 70 of 35? - Family - land
The Veselý family bought a plot of land measuring 30½ m by 26⅔ m. Before they start building, they want to fence it. How many metres of fencing do they need to buy if they leave 2⅞ m for the gate?
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