Maths practice for 14 year olds - page 276 of 361
Number of problems found: 7214
- Circle in rectangle
We cut the largest possible circle from a paper rectangle with 25 cm and 15 cm sides. How many % of the area of the rectangle is the area of the circle? - Square root sum
Determine the sum of the square roots of the number 12. - Exponent value
Determine x if 3^x: 3²996 = 81 - Percentage calculation
0.6 percent of n is 18. calculate n. - Car speeds
The distance from Nitra to Ostrava is 257 km. From both places, two cars drove towards each other at the same time. The car from Nitra drove 800 m/h slower than the car from Ostrava. What was the average speed of each car if they met after 150 minutes of - Triangle angles
Calculate the size of the interior angles of a triangle if the size of the second angle is 120 degrees less than twice the size of the first angle and the size of the third angle is equal to the difference between the sizes of the first and second angles. - Bar cuts
Peter cut the two bars into equal parts but made them as large as possible. One rod measured 42 cm, the other 63 cm. How many cuts did he have to make? - Goal divisions
School players scored seven goals in the match. List all possible goal divisions into three-thirds and add up how many. - Field planting
The 102-hectare field is to be sown with flax and planted with potatoes. The area sown with flax should be three times smaller than the exchange planted with potatoes. Which acreage should be planted with flax, and which should be planted with potatoes? - Wall diagonal
Calculate the length of the face diagonal of the cube, whose surface is 384 cm square. - Dried apples
How many kilograms of fresh apples are needed for 120 kg of dried apples when we get 75 kg of dried apples from 0.4 tons of fresh apples? - 925 USD
Four classmates saved an annual total of 925 USD. The second saves twice as the first, the third 35 USD more than the second, and the fourth 10 USD less than the first. How does USD save each of them? - Number probability
There are numbers from 1 to 20 in the hat. What is the probability that we will pull out from the hat: a / one-digit number b / prime number c / number greater than 11 d / a number divisible by six Thank you - Alcohol preparation
We want to prepare 200 g of 64% alcohol. We have a sufficient amount of 80% and 45% alcohol. How many of which will we need? - Exponent equation
Determine what x equals in the equation: (256^x): 10-1 = 40 - Rectangle diagonal
Calculate the diagonal length of a rectangle whose length is 3 cm greater than its width and whose circumference is 18 centimeters. - Algebrogram
Solve algebrogram: mama+anna=vari How many solutions are? - Trapezoid bases
In a trapezoid, the difference between the bases is 6 cm. Calculate the lengths of the bases of the trapezoid when its height is 8 cm and the area of the trapezoid is 168 cm². - Spray - mixture
4 per mille of active ingredient is needed per 6 liters of water to prepare sprays. How many milliliters of active substance do we add to the sprays? - Dividends The three friends divided the win by the invested money. Karlos got three-eighths, John 320 permille, and the rest got Martin. Who got the most, and which got the least?
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