Maths practice for 12-year-olds - page 145 of 362
Number of problems found: 7223
- Transported 43451
A sandpit on a playground is shaped like a circle with a diameter of 3 meters and a depth of 25cm. How many cubic meters of sand are needed? Determine the weight of the transported sand if 1 m³ of sand weighs 800 kg. - Distance 43431
On a map at a scale of 1:250,000, the line shows a distance of 15 km. How many cm does this line measure on the map? - A football
A football team loses 5 yards on one play, then loses 7 yards on the next play. Write a different expression that represents the change in position. Then, find the sum of the values. - Previous 43371
The sum of three natural numbers, five greater than the previous one, is 204. What are the numbers? - Who I
Who am I? My third is two less than my half. - Difference 43311 We have the number A = 753 672. Calculate the difference between it and the number A rounded to tens of thousands.
- Specified 43301
The water tank has the shape of a block. The bottom of the tank is square, with a side length of 3 m. There are 22,500 liters of water in the tank. To what height in meters does the water in the tank reach the specified amount?
- Temperature drops
If the temperature of a city drops 2° every day and increases by 3° every five days, how long does it take to drop to -15° from temperature +5°? - Timothy
Timothy is 56 4/5 inches tall. Theresa is 1 1/6 inches shorter than Timothy, and Jane is 1 1/3 inches shorter than Theresa. How tall is Jane? - Volunteers
Volunteers helped clean up 8.2 kg of trash in one neighborhood and 11 1/2 kg in another. They sent 2 3/5 kg to be recycled and threw the rest away. How many kilograms of trash did they throw away? - The inflated
The inflated gymnastic ball should have a diameter of 65 cm. How many times do we have to pump air into a full-blown ball with a bicycle inflator to inflate it if the working volume of the inflator is a cylinder with an inner diameter of 2 cm and a height - The granite ball
What is the weight of a granite ball with a radius of 60 cm if 1 m³ of granite weighs 2.7 tons? - The vase
There were roses in the vase. Half were red, a quarter was white, and 12 were yellow. How many roses were in the vase? - Cloth / textile
We have a cloth measuring 16 square meters. How many 20 cm by 20 cm by 8 cm bags can you make? Assume the bag is a cuboid without one top base. - MO Z7–I–6 2021
In triangle ABC, point D lies on the AC side and point E on the BC side. The sizes of the angles ABD, BAE, CAE, and CBD are 30°, 60°, 20°, and 30°, respectively. Find the size of the AED angle.
- Perimeter of a rectangle
Find the perimeter of a rectangle with a length of 1/2 feet and a width of 1 1/3 feet. - Second 43001
On the first day, Lenka read half of the book. On the second day, half of the rest, and on the third day, she read 35 pages and read the book. How many pages did the book have? - Gold fabric
Katy and her girlfriends went to the store to buy supplies to make a costume for Katy's school play. They needed 7 ½ meters of gold fabric. If each meter costs 3.4 USD, how much will 7 ½ meters cost? - Chocolate chip
Out of 28 cookies, 3/4 are chocolate chip. How many cookies are chocolate chip? - Unknown number
4/5 of a number is 276. What is 2/3 of the same number?
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