Math practice for 13 year olds - page 355 of 414
Number of problems found: 8279
- Surface area 2
Calculate how many % reduce the surface area of the cube is reduced the length of each edge by 10%. - Dig water well
Mr. Zeman is digging a well. Its diameter is 120 cm, and it is planned to be 3.5 metres deep. How long (at minimum) must a ladder be for Mr. Zeman to climb out? - Ethernet cable
Charles and George are passionate gamers and live in houses opposite each other across the street so they can see each other through the windows. They decided their computers would connect to the telephone cable to play games together. Charles lives on th - Divisibility by 12
Replace the letters A and B with digits so that the resulting number x is divisible by twelve /find all options/. x = 2A3B How many are the overall solutions? - Angle calculations
Calculate the sum and difference of the alpha and beta angles. Alpha = 60 ° 30 ', beta = 29 ° 35'. - Liquid soap
Liquid soap lasted two weeks for one member of the family. How many days will it last if it is used: a) two members b) 4 members c) seven members? - Bus and Milan
A bus left the village at a speed of 60 km/h. One kilometre later, Milo set off on a motorcycle with his grandmother to catch the bus. When they found the bus had already left, they tried to catch up. At the next stop, 3 km away, they caught up with the b - Grass garden
Mr. Grass would mow the garden for 5 hours, and his son Michael could do it for 7 hours. They agreed to wake up at 5 AM and begin to mow together. Ms. Grass needs to drive into town at 8:30. Michael says that at that time, they're done with work. Is he ri - Cabinet painting
The cabinet is shaped like a block, with dimensions 120 cm and 150 cm on the front side and 120 cm and 60 cm on the upper wall. It is painted twice on the outside. When 1 kg of paint is enough to paint 8 m2, how much paint is used to paint the - Cube edge
Determine the length of the cube's edge, the volume of which is equal to 60% of the volume of a block measuring 7cm, 8cm, and 6cm. - Scale of the map
Determine the map's scale if the distance between A and B is 720 km and the distance on the map is 20 cm. - Original price
What was the price of the washing machine if, after an increase of 35%, it cost 12690 €? - Stairway
The stairway has 20 steps. Each step is 22 cm long and 15 cm high. Calculate the length of the handrail of staircases if the top and bottom exceed 10 cm. - The cellar
Mr. Novák has a cellar, and the cellar window in the chalet is a 0.6-meter square window. The window wishes to place an X-shaped grid in a square. He uses iron welded bars. Calculate the lengths of individual bars and the total length of the bars he has t - Four ropes
Four ropes anchor the TV transmitter at a height of 44 meters. Each rope is attached 55 meters from the heel of the TV transmitter. Calculate the number of meters of rope used to construct the transmitter. When each attachment is needed, add an extra 1/2- - Dragon altitude
The kite is tied to a string 85 meters long and hovers over a place 60 meters away from us. Calculate how high the dragon hovers. - Rectangle and diagonal
In the rectangle ABCD, we know the side length is AB = 16 cm, and the diagonal AC = 20 cm. Calculate its perimeter and area. - Reduce of the volume Calculate how many % reduce the volume of the cube is reduced the length of each edge by 10%.
- The double ladder
The double ladder has three meters-long shoulders. What is the height of the upper ladder reach if the lower ends are 1.8 meters apart? - Ladder
The ladder has a length of 3.5 meters. It is leaning against the wall, so the bottom end is 2 meters from the wall. Find the height of the ladder.
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