Maths practice for 12-year-olds - page 254 of 347

Number of problems found: 6923

Casting material
What material is the casting that weighs 45.2 g and has a volume of 4 cm³? If it is a simple chemical element, write its chemical symbol.
Cooling liquid
Cooling liquid is diluted with water in a ratio of 3:2 (3 parts by volume of coolant with two volumes of water). How many coolant volumes must be prepared for a total of 0.7 dm³ (liters) of the mixture?
Line segment
Divide a 15 cm line segment into two parts so that their lengths are in a ratio of 2:1. What is the length of each part?
Brackets 2
Add parenthesis to make true: 5-2×6-4+2=5
Fuel consumption
The car consumes 6.7 liters per 100km 2. The car consumes 108ml per 1500m. What percentage of more or less gasoline does the 1st car use than the 2nd car to cover the same distance?
Motorcycle and car
A car travels 11000 decimeters per minute, and a motorcycle travels at a speed of 330 meters in 11 seconds. They leave Prague from the same place, and the motorcycle leaves 45 minutes later behind the car. Who will be closer to Vimperek after an hour and
Tree planting
Štěpán is planting trees. If he had planted 12 trees every hour instead of 9 trees, he would have finished 1 hour earlier. How many stems should he plant?
Floor cost
How much does it cost to lay a floor in three classes if each class has dimensions of 8 m by 6 m and a square meter of 1 m costs 15eur?
Number sum
What is 2/3 of the sum of numbers (0.10) and (-5.3)?
Sum calculation
Calculate the second sum if you know that one sum is -124.6 and the resulting sum is (-200).
Mixing operations with numbers
Subtract twice the number -23.6 from the difference between the numbers -130 and -40.2.
Number difference
Calculate the difference between the sum of the numbers 1.04 and 0.56 and the product of the numbers opposite to them.
Temperature measurement
In the evening, Zuzana measured the air temperature at -2.4 °C. In the morning, she measured the temperature three times lower. What temperature did Zuzana measure in the morning?
Finding Second Summand
Calculate the second summand if you know that one summand is 28.6, and the result of the sum is -100.
Elevator floors
A skyscraper occupied his car in an underground garage marked with buttons in elevator number -3. He drove to his floor, number 26. How many floors did he take in the elevator?
Timeline calculation
Archimedes was born in -287. Caesar was born in -101. How many years later was Caesar born?
Square diagonal
The area of the square is equal to 2.56 square meters. Calculate its diagonal.
Snowman 3
During the last winter carnival, the local college students built a 30- foot snowman out of 109 tons of snow. How much snow will be needed to build a 36- foot snowman this year?
Cardboard
How many m² of cardboard are needed to make the cuboid with dimensions 40 cm, 60 cm, and 20 cm?
Clock path
The minute hand on a clock is 14 cm long. What distance does the tip of the hand travel in 35 minutes?

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