Maths practice for 12-year-olds - page 191 of 355

Number of problems found: 7084

Harvester wheat calculation
Rope wheat harvests seven combine harvesters in 5 days at total capacity. The weather forecast is required to complete the harvest in 4 days. How many combined harvesters had to be used together?
Class girl calculation
One-fifth of the girls are honored in the class, and the remaining eight girls are doing well. How many girls are in the class?
Triangle branch length
The right triangle has an area of 225 cm². One of its branches is twice the size of the other. Find the lengths of its hangers.
Wheat sowing calculation
The farmer crossed the daily plan to sow wheat by one-fifth and sow in an 11.4 hectare field. Calculate his daily schedule.
Reducing
Reducing the unknown number by 427, we get 65% of its value. What is an unknown number?
Class student formula
There are x girls and nine boys in the class. Write a formula for the number y of all students in the class. Express the number of girls from the formula.
Two rectangular boxes
Two rectangular boxes with dimensions of 5 cm, 8 cm, 10 cm, and second of 5 cm, 12 cm, and 1 dm will be replaced by a single cube box of the same cubic volume. Calculate its surface.
Ant food transport
Fifteen ants bring 10 g of food to the anthill in 1 hour. In how many hours will five ants carry 1 kg of food?
The largest
We cut the largest possible cylinder from a 20 cm cube. What is the volume of this cylinder?
Cube edge calculation
What is the edge size of a cube with an area of 37.5 m²?
Pool sidewalk tiles
The rectangular pool has dimensions of 10.5m and 8m. There is a 1m wide trail around it. How many m² of tiles are needed to pave the sidewalk?
Family step retrace
The family went on a trip to a ruin 6 km away. The father had a step length of 0.75 m, the mother of 0.6 m, and little Eva 50 cm. They went out on the same step. How many times did their steps retrace before reaching their destination?
Pool water calculation
How much water is in a cylinder-shaped pool with a radius of 2m, which is 1.5 m deep if it is filled 10 cm below the edge rounded to one decimal place
Cup container calculation
I poured ten full cups with a radius of 5 cm and a height of 10 cm into a container with a volume of 8 liters. How many liters are in the container?
Seat fabric calculation
How much fabric will be needed to cover a cylinder-shaped seat with a diameter of 0.8 m, 0.6 m high (rounded up to whole square meters)
Roller coverage area
The roller on the tennis court has a diameter of 60 cm and is 1.2 m wide. What area will the roller cover in one turn? They rounded to one decimal place.
Cylinder volume comparison
The cylinder has a volume of 200 liters. What is the volume in liters of a second cylinder twice as wide and half-height? (π = 3.14)
Machine production calculation
In the factory, they produced 1,500 products a week on five machines. How many machines do they need to produce 2,000 products a week?
Classmate seating arrangements
Classmates Anka, Bea, Villa, and Danka can sit next to each other on the bus. What and how many ways can they sit down?
Nutballs
The dough for nutballs contains, among other things, two basic raw materials: flour and nuts, in a ratio of 2:1. How much flour is needed, and how many nuts are needed for 1 kg of dough if the "other" is 100g?

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