Maths practice for 12-year-olds - page 261 of 351
Number of problems found: 7008
- Pumping
The tank is filled with a larger pump in 12 hours and with a second pump in 15 hours. For how long does the tank fill when both pumps are switched on at the same time? - Natural numbers
How many natural numbers can we create less than 301 from the number 0,1,2,3,6,7? - Dimensions 5143
Mr. Winter is building a fence from perforated brick elements in the shape of a cuboid with dimensions of 15 cm, 15 cm, and 20 cm. the fence will be 15 cm wide, 150 cm high, and 10 m long. The mortar space will occupy 0.25 m³. How many brick elements does - Pins 2
How many different possible four-digit pins can be found on the 10-digit keypad? - A map
A map of size 60cm by 25cm is reduced in the ratio of 3:5 twice. What are the new dimensions? - Cuboid
Cuboid has a surface of 516 cm². Side a = 6 cm and b = 12 cm. How long is the side c =? - Cylinder 5123
The well has the shape of a cylinder with a base diameter of 1.2 m. From the surface to the surface, it is 4 m, and the water depth is 3.5 m. How many m³ of soil had to be dug when digging the well? How much water (in cubic meters - m3) is in t - Direction 5122
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. - International 5119
According to the International Health Federation, chickens shorten their lives by an average of 16 years. What percentage of chicken currencies survive if the average age is 76? - 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; ABCD trapezoidal data: AB base length is 8 cm, CD base length is 3 cm, BC arm length is 4 cm, and AC diagonal length is 7 cm. L - Bike wheel
The bike wheel has a radius of 30cm. How often does it turn if we go on a 471m bike? - Inter city bus
The inter-city bus leaves Suva at 10.00 am and reaches Nadi at 1.00 pm, covering a distance of 219km. How long did it take to reach Nadi? - Outflow 5107
1000 l of water will drain in one outflow in 4 hours. How many hours will it take for 9000 l 3 drains to drain? - Describe 5105
How many times less would the hour hand per week describe if it was as long as the minute hand? - Kilograms 5101
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 I find the triangle type if the angle ratio is 2:3:7? - Competition 5095
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 5093 How many can you create three-digit numbers from the numbers 1,3,5,7 if we must not repeat the numbers?
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