Maths practice for 12-year-olds - page 265 of 354

Number of problems found: 7071

Runners lapping
Two runners run on a 3200m oval track, one running at 12 km/h and the other at 8 km/h. How long does it take for the first runner to finish the second one?
Megapascals
What is the area of cross-section of the piston if the force of 300 kN produces a pressure of 5 MPa?
Tomato sticks
The gardener has ten sticks 160 cm long and five sticks 220 cm long. If each stick is 7 cm long, how many tomato sticks can it make?
Gear wheels
There are two gears in the wall clock. The larger wheel has 54 teeth, and the smaller one has 24 teeth. How many times does the small wheel turn if the big one turns four times?
Ounce
749 calories in a 7 - ounce serving. What is the unit rate?
Bicycles
You're the owner of the transport's learning playground. Buy bicycles of two colors, but you've got to spend accurately 120000 CZK. The Blue bike costs 3600 CZK and the red bicycle 3200 CZK.
Rainwater barrel
There are 1.5 hectoliters of rainwater in the barrel. Two-fifths of the water passed from the barrel while watering the garden. How many liters of water remained in the barrel?
Apple harvest
Pupils collected a total of 42 kg of apples. Peter harvests half as much as Zuzka and Martin, a third less than Petr. How much did each of them harvest?
School 6
Jirka lives 600m from the school, and Honzík 1200m. How many kilometers a week does Honzik go over Jirka on his way to school and back? How many times will more Honzík go than Jirka?
Earth and Sun
Earth is 150 million km away from the Sun. 300,000 km of sunlight travels in 1 second. How long will the light come from the Sun to the Earth?
Railway wagon
The railway wagon holds a 75 m³ load. The wagon can carry a maximum weight of 30 tonnes. What is the maximum density that may have material with which we could fill this whole wagon? b) How much peat (density 350 kg/m³) can carry 15 wagons?
Steps
The walkway from the house to the school is 180 m long. If Michael's step is 60 cm and his father's step is 90 cm, how many more steps does Michael make than his father on the way to school?
Distance of numbers
Which number has the same distance from the numbers -5.65 and 7.25 on the numerical axis?
Bronze medal
To produce 1 kg of bronze must be 0.95 kg copper, 0.04 kilograms of tin, and 0.01 kg zinc. The bronze medal weighs 8.5 g. How much copper, tin, and zinc does the medal have?
Divisible numbers
How many three-digit numbers divisible by four can we create from the numbers 1, 2, 3, and five if we cannot repeat the digits in the number?
Ratio - proportion
Reduce the number 16 in proportion. 3:2 5:4 11:8
Digit sum
Which largest six-digit number has a digit sum of 27?
Strawberry jam
Friends Marika and Katka decided to prepare strawberry jam together. According to the recipe, they needed 50g of sugar for 0.5kg of fruit. How many kilograms of sugar must the friends prepare if they make jam from 2.3 kg of strawberries?
System equations
Determine the smaller root of the root pair of the system of equations. 5a + 4b = 11 3a - 2b = 11
Studio flooring
The television studio plan is made on a scale of 1:150. It shows a rectangular studio measuring 5 cm and 6 cm. If we pay 356 crowns for 1 m² of floating floor, how many crowns will we pay to cover the studio with a floating floor?

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