Maths practice for 12-year-olds - page 257 of 354

Number of problems found: 7071

Kilo candy
One kilogram of chocolate candy costs 10 euros. Kate bought 250 grams and had the eight-pack of candy. How much does one bonbon cost?
Chicks
How many chicks were hatched from 4500 eggs, while an average of 100 eggs hatched 87?
Liter of gold
What weight does one dm³ of gold have? Gold density is 19,300 kg/m³
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.
TV VAT
The dealer sells a TV for 750 euros. If he sells it, he must pay 20% VAT to the state. How many euros will he pay for the sale of one TV?
VAT on books
The cost of a book in the store is 12.5 euros. How many euros is the VAT of this book? VAT is 10%.
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
Cut a line segment of 15 cm into two line segments so that their lengths are in a ratio of 2:1. What length will each have?
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 8m by 6m and a square meter of 1m 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?
Christina - Samuel
Samuel is 2 cm higher than the average height of the pupil in the class. Christina is 7 cm lower than the average height. How taller is Samuel than Christina?
Average temperature
Calculate the average daily temperature from 8 measured values during the day: -8; -5; -5; 1; 3; 0; -4; -6 °C ...

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