Maths practice for 12-year-olds - page 186 of 351
Number of problems found: 7018
- Line part comparison
The line AB, whose length is 24 cm, is divided in a ratio of 5:3. How much longer is its larger part? - Line length change
The given line is MN with a length of 11 cm. Change its length in the ratio: a) k = 2:1 b) k = 1:2 c) k = 17:11 d) k = 22:33 - Line division calculation The KL line is 12 cm long. Point X divides the line in a ratio of 1:5. What is the length of line XL if point X is closer to point K?
- Square - increase sides
If we increase the length of one pair of opposite sides of the square by 2 cm and the length of the other two sides by 1 cm, we will create a rectangle, the perimeter of which will be 10% larger than the perimeter of the original square. What is the side - Block volume area
A cuboid has a rectangular base 2.6 m long and 2.2 m wide. The height of the cuboid is 1/8 of the base's perimeter. Calculate the volume and surface area of the cuboid. - Lake path calculation
Lake Trasimeno is approximately in the shape of a circle, its area is about 28 square kilometers, and Mr. Hector's walking speed is approximately 4 km/h. Calculate the length of the path around the lake and how many hours Mr. Hector would have to walk to - Staircase step calculation
The staircase has 36 steps, each 20cm high. How many stairs will the same staircase have if the height of the stairs is 18cm? - A swimming pool
A swimming pool holds 30000 lt of water. How many gallons does it hold? 1 gallon= 4.55 lt - Test point threshold
According to school regulations, a student receives an excellent grade if he achieves at least 26 points in a test with a total of 30 points. What is the minimum number of points a student must obtain in a test with a total of 50 points if the same passin - The florist
A consignment of 200 roses arrived at the florist in the morning. She sold more than half of them during the day. She wants to tie bouquets of the remaining roses. One rose will always be left if she ties a bouquet of three, four, five, or six roses. Dete - Wooden board weight
What is the weight of a wooden board 1.8 m long, 70 cm wide, and 5 cm high? The density of wood is p = 450 kg/cubic meter. - Outside tangents
Calculate the length of the line segment S1S2 if the circles k1 (S1, 8 cm) and k2 (S2,4 cm) touch the outside. - Land acreage calculation
The land has a rectangular shape with 75 m and 450 dm dimensions. Calculate the acreage of the land and, convert the result, and round to whole ares. - Class student ratio
The class's ratio of boys to girls is 5:7. There are ten boys. How many students are in the class? - Pool tarpaulin cost
The circular pool with a diameter of 3.5 m is covered with a circular tarpaulin made of rubberized fabric for CZK 110 per square meter. Determine how much the tarpaulin cost if you know that its radius is 25 cm larger than the radius of the pool. - Minute hand distance
The distance between the tip of the minute hand and the center of the dial is 12 mm. Determine the distance traveled by the tip in 45 min. (draw a clock face and a minute hand and realize the distance it will cover in 45 min.) - The freezer
1. The temperature inside a freezer is minus 23 degrees Celsius. The temperature falls by a further 12 degrees Celsius. What is the new temperature? 2. What is the difference between temperatures of 12 degrees Celsius and 210 degrees Celsius? - Kilometers
The scale of the map is 1:100,000. How long is the road, which is 4.7 cm long on the map, really long? - Five-digit divisibility
Find the smallest five-digit number A432B that is divisible by 15. - Candy ratio sharing
Lucy, Jan, and Matthew shared the candy in a ratio of 3:4:5. Matthew got 20 sweets. How many candies did they share?
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