Maths practice for 12-year-olds - page 50 of 350

Number of problems found: 6993

Carpet area
How many meters of carpet 3 meters wide are needed to cover a square floor with a area of 36 square meters?
Garden 83367
How many meters of mesh is needed to fence a square garden with an area of 5,402.25 square meters?
Calculate 83366
Calculate the side a of triangle ABC if we know va=8cm, b=16cm, vb=10cm.
Length 83358
A block-shaped pool has a length of 50m, width of 25m, and depth of 3.5 m. When the pool is filled 50 cm below the edge, how many hectoliters of water is in it? If we paint the inside of the pool two coats and you pay 50 cents per 1m², how much
Beautiful garden
If 10 mm of water fell on a trapezoid-shaped garden with bases of 30 m and 20 m and a height of 20 m, how many buckets of water would we need to water the garden equally abundantly if the bucket had a volume of 15 l?
Electricity bill - share
Three roommates divided the electricity bill according to the time spent on the PC. Adam and Brano's time is divided in the ratio of 1:4, and Brano and Damian's time is divided in the ratio of 2:5. In what proportion do all three boys spend the time at th
Dice - 5 times
We roll the dice five times. Make sentences: a) 3 events that definitely cannot happen. Write a reason for each. b) 3 events that will definitely occur; write a reason for each. Another problem: 3 events that may or may not occur for each. Write a reason.
Refueling 83303
A liter of gasoline costs €1.2. After refueling, my car weight increased by 15 kg. The density of gasoline is p=750kg/m³. How many euros did I fill up with?
Calculate rhombus
Calculate the height of the rhombus ABCD on side BC if AB=7cm, BC=5.5cm, and the height of the first side on AB=4.4cm.
Numbers 83301
On the number line, display all real numbers greater than or equal to two and less than 5.
Rainwater 83296
What volume must a cylinder-shaped tank have to collect rainwater from the flat roof of a cube-shaped house if the house is 12m wide and reports 50mm of rainfall?
Hourglass ticks
The hourglass ticks three times in 5 minutes. How many times do they spill in 2 hours?
Candies 83291
Jana and Klara divided the candies in a ratio of 15:18. Klára got 90 candies. How many candies were there?
Another 83290
Petra pushed a chair from one room to another with a force of 60N. She did 300 J of work. How far did Petra push the chair?
Bicycle wheel
What is the diameter in centimeters of the wheel of a bicycle if it turns 2000 times on a track 4082 m long
Cylinder's 83288
Calculate the radius of the cylinder's base if its volume is equal to 12.56 cm².
Quadrilateral pyramid
Calculate the surface area and volume of a regular quadrilateral pyramid whose base edge is 5 cm long and whose height is 10 cm.
Fractions: 83269
Equations with fractions: 3y - y+3/4 = 1+y/2
Right triangle - legs
Calculate the area of a right-angled triangle ABC with a=15 cm, b=1.7 dm.
Lollipops 83262
Mom bought 6 lollipops for €17. If the cashier rounded up the purchase price to whole euros, what was the least one lollipop could cost?

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