Maths practice for 12-year-olds - page 254 of 347
Number of problems found: 6932
- Aquarium filling
The aquarium, with a length - of 40 cm, width - of 24 cm, and height of 27 cm, is filled to 2/3. How much water do we need to add to be filled to 8/9? - Square area
Complete the table and then draw each square. Provide exact lengths. Describe any problems you have. Side Length Area Square 1 1 unit² Square 2 2 units² Square 3 4 units² - Big Ben clock
They had three tower clocks in the city. Some went right, others were 10 minutes ahead of the day, and the third was 12 minutes late each day. One day, they struck all the clocks at noon at once. How long will it be like this again? - Simple equation 3
24 = n • 27, solve for n - Shirt
Mrs. Vítková bought each of his three children the same shirt and paid CZK 1,000. The saleswoman returned 568,60 CZK. What was the price of one shirt? - 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. - 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.
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