Maths practice for 12-year-olds - page 223 of 352
Number of problems found: 7023
- Calculation 7316
The king divided part of his lands between his three sons. To the first, he gave one-fifth. To the second, he gave 40 ha less than the first, and to the third, he gave 30% of the whole. Write down what part of the land was left to the king. Calculation us - Continued 7310
In one workshop, they will do the given work in 15 days; in another workshop, where more members work, they will do the given work in 10 days. After three days of joint work, only the larger workshop continued the assigned work. In how many days will he f - Water in a cube
How many ml of water will fit in a cube with an edge length of 5 cm? - Remaining 7307
At the hockey match, the stadium was full at the beginning. After the first period, 20% of the fans left; after the second period, one-sixth of the remaining fans left. How many fans were in the stadium at the start of the match if 700 stayed until the en - Two-quarters 7299
Two-quarters of the flowers are red. One-third is yellow, and three flowers are blue. The bouquet has a total of __ flowers. - Distance 7296
The cyclist covered a certain distance in 9 hours. How many hours does a car need to travel four times more if it moves three times faster? - Castle windows
Seven twelfth windows in the castle are in the shape of an n-gon. Six-fourteenths of these windows are quadrangular in shape, while two-ninths of them are square windows. How many windows are there in the castle if there are 15 square windows? - Measures 7291
The garden has an area of 1378 m2, side and measures 53m. How much does side b measure? - Circumscribed 7290
Calculate the area of a regular hexagon if the radius of the circle circumscribed is 6.8 cm. - Harvesters
The first harvester will harvest the grain from the field in 20 hours, and the second, the more powerful, will harvest it in 10 hours. How long will it take for both harvesters to harvest this field if the second harvester has to be set up first, which ta - Grinding 7285
By grinding wheat, we get 86% torment. How much wheat do we need to grind to get 7 tons of wheat flour? - Consumes 7282
A person consumes 20 grams of oxygen in 1 hour, and a jet aircraft up to 3 total of 3/4 tons. How much more oxygen does an airplane use per hour than a human? - Squares 7281
They drew two stone squares out of 25 stones. Not a single stone must remain. - Millimeter 7269
The road is paved with 2500cm cubic cubes. Calculate the edge size to the nearest millimeter. - Craftsman 7263
To make a ladder, the craftsman needs to cut as many rungs of the same length as possible. He is to cut them from two boards, one is 220cm long, and the other is 308cm long. How long will the bars be, and how many will there be? - Bob traveled
Bob traveled 20 meters to Dave's house. He arrived in 3 minutes. What was his average speed for the trip? - The aquarium
The aquarium has a capacity of 18 liters. When the square bottom is 28 2/3 cm long, what is its height? - Volumes 7252 The block and the cube have the same volumes of 512 cm3, and the block has edge lengths of b = 6.4 cm and c = 10 cm. Can a cube and a block have the same edge length?
- Find x
Solve: if 2(x-1)=14, then x= (solve an equation with one unknown) - Advertising 7236
The advertising agency invented a new shape for billboards to attract attention - a trapezoid. How much more m² of area did they gain if the size of the classic billboard is 5.1x2.4m and the dimensions of the trapezoidal billboard are 4.2 and 6m bases and
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