Math practice for 13 year olds - page 327 of 423
Number of problems found: 8458
- Diameter 4078
What is the diameter of the wheel when it turns 455 times per 1 km? They rounded to the nearest cm. - Rectangle 4077
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? - Efficiency 4073
Determine the efficiency of a vacuum cleaner with a power input of 1.2 kW when the suction power is 360 W. - Efficiency
What is the power output of a kettle 2 kW with an efficiency of 90%? - Plane II
A plane flew 50 km on a bearing of 63°20' and then flew in the direction of 153°20' for 140km. Find the distance between the starting point and the ending point. - Determine 4057
Determine the sum of the square roots of the number 12. - Centimeters 4054
Find the surface of the cylinder if its diameter is 12 centimeters and its height is 9 centimeters. - Calculate 4052
0.6 percent of n is 18. calculate n. - Difference 4050
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. - Measured 4046
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? - Potatoes 4043
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? - Trapezium bases
Find the trapezium's height if a = 8 cm and c = 4 cm, and its area is 21 square centimeters. - Wall diagonal
Calculate the length of the wall diagonal of the cube, whose surface is 384 cm square. - Continues 4034
Karel always follows the same route to school. If he continues at the store, the journey takes him exactly 10 minutes. If he stops at a store to buy a snack, his journey takes 5 minutes longer. In November 2015, his journey to school took an average of 13 - Trapezoidal 4031
The aquarium has the shape of a prism with a trapezoidal base. The length of the basic trapezoid is 60 cm and 80 cm, and the height of the trapezoid is 70 cm. The aquarium holds 196 liters of water. How tall is the aquarium? - The terrace
Around the round pool with a diameter of 5.5 meters is a wooden terrace with a width of 130 cm. What is the area of the terrace? - 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? - X-2 4025
x-2 / x-1 -2 = x + 1 / x-2 - Temporary sale off
With a temporary price reduction, the jacket's original fee of CZK 1,850 was reduced by 20%. Later, it was raised again by 20%. What was the jacket's final price? - Probability 4020
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
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