Maths practice for 12-year-olds - page 267 of 359

Number of problems found: 7167

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?
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 Kate decided to prepare strawberry jam together. According to the recipe, they needed 50 g of sugar for 0.5 kg 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?
Syringe and patient
In 1 ampoule of 2 ml is 15 mg of Dipidol. The patient should receive 10 mg. How much ml do I draw into the syringe?
Dosage calculation
There is 50 mg of Dolsin in 1 ampoule with a content of 1 ml. The patient should receive 70 mg. How many ml will I draw from the second ampoule into the syringe?
There
There are 24 students in the class. The math class is divided into two groups of 12 students on Friday. The table shows the results of pupil assessment in the two groups. Three students in the first group had worse grades than those in the second group. T
Ice cream servings
They sold 4/7 strawberry ice cream and 36 servings of vanilla ice cream in the store. How many servings of ice cream did they sell that day?
Cylinder diameter
The volume of the cylinder is calculated as V = 1/4 pi times d on the type times v. Express the average d using the volume V and the height in the cylinder. Calculate d for V = 1000 l and v = 23 dm
Have solution
The sum of four consecutive even numbers is 92. Determine these numbers.
Real estate
The residential house has three entrances numbered by odd numbers in arithmetic progression. The sum of the two numbers on the corner entrances is 50. Calculate the highest of these three numbers.
Rectangle
Find the dimensions of the rectangle, whose perimeter is 108 cm and the length is 25% larger than the width.
Apple distribution
Grandma had apples. When she gave seven to her grandfather, they both had the same. When Grandpa gave five apples to Grandma, she had three more than Grandpa. How many apples did each initially have?
Prime product
My number for today: the product of the square of the smallest prime number with the smallest two-digit prime number

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