Maths practice for 12-year-olds - page 262 of 359
Number of problems found: 7167
- Meeting time
At 7 o'clock, a truck drove from Olomouc towards Hradec Králové at an average 40 km/h speed. A passenger car left Hradec Králové, 210 km from Olomouc, in 7 hours 45 minutes with an average speed of 80 km/h. At what time and how far from Olomouc will they - Surface of cuboid
Find the surface of the cuboid if its volume is 52.8 cm³ and the length of its two edges is 2 cm and 6 cm. - Smoking survival
According to the International Health Federation, smoking shortens a person's life by an average of 16 years. By what percentage is a smoker's life shorter if the average human lifespan is 76 years? - Trapezoidal prism
Calculate the surface of the quadrilateral prism ABCDA'B'C'D' with the trapezoidal base ABCD. The height of the prism is 12 cm; Trapezoid ABCD has the following dimensions: AB base length is 8 cm, CD base length is 3 cm, BC arm length is 4 cm, and AC diag - Bike wheel
A bicycle wheel has a radius of 30 cm. How many times does it rotate if we cycle 471 m? - Inter city bus
An inter-city bus leaves Suva at 10:00 AM and reaches Nadi at 1:00 PM, covering a distance of 219 km. How long did it take to reach Nadi? - Water drainage
1000 l of water will drain in one outflow in 4 hours. How many hours will it take for 3 drains to empty 9000 l? - Clock hands
How many times less would the hour hand per week describe if it was as long as the minute hand? - Apple weight
The box with apples weighs x kg. Empty box y kg. How many kilograms of apples are in twenty boxes? - Volume of cube
Solve the volume of a cube with a width of 26cm. - Type of triangle
How do you determine the type of triangle if the angle ratio is 2:3:7? - Team composition
Ninety boys and 48 girls signed up for the sports competition. How many members of boys' and girls' teams can we assemble so that they have the largest number of members and the same number of members in the boys' and girls' teams? - Three-digit numbers
How many can you create three-digit numbers from the numbers 1,3,5,7 if we must not repeat the numbers? - Brick pillar
The brick pillar with a cross-section of 41x77 cm has a height of 3.25 m. Calculate: (a) the volume of the pillar b) the required number of bricks (if we need 400 pieces per 1 cubic meter) - Clocks The length of the minute hand is 12 cm. What track in meters will its endpoint describe in a week?
- Prism dimensions
We will double one block dimension and reduce the other by a third. How does its volume change? - The barrel
The barrel is 135 cm high. If we fill it to a height of 60 cm, it weighs 163 kg. If we fill it to a height of 80 cm, it weighs 213 kg. How many kilograms weigh a full and how many empty barrels? - Seedling spacing
We will plant 24 lettuce seedlings on the 8.4 m long flowerbed. How far apart will we place them? (Ignore the margins at the beginning and end of the flowerbed.) - Production plan
They have already produced 2,000 parts in their grandfather's workshop, which is five-sixths of the plan. How many parts should they produce in total? - Concert attendance
Eight hundred people came to the concert, a quarter more than the organizers expected. How many people did the organizers expect?
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