Math practice for 13 year olds - page 118 of 415
Number of problems found: 8285
- Grandma 9
Grandma bought 2 kilograms of apples at a CZK per kilogram, 5 kg of potatoes at b CZK per kilogram, and one celery for 12 CZK. She paid with three fifty-crown coins. ○ Depending on the values a and b, express in CZK the amount of change Grandma received. - Paper collection
A class with m pupils agreed that each pupil would collect k kilograms of paper. Before the collection began, one pupil moved away and did not hand over any paper. o In dependence on the quantities k, m express: a) how many kilograms of paper each pupil h - Prism height expression
The prism with a square base has a volume of 200 liters, and the length of its base edge is a decimeter. Using the corresponding expression of the prism, write the height of the prism in decimetres. - Target zone probability
The target is divided into three zones. The probability of a shooter hitting the first band is 0.18, the second band 0.2, and the third band 0.44. What is the probability that a) hits the target, b) miss the target? - Dice probability greater
What is the probability that the number a) greater than 4, b) Will the number greater than four fall on the dice roll? - Ski area preparation
A winter ski area is to be prepared by five snow groomers in 6 days. Due to great interest from skiers, after two days reinforcement was called in the form of another three equally performing snow groomers. Decide for each of the following statements whet - Number multiplication expression
Determine the number by which we must multiply the expression (square root one plus one whole and one quarter) to obtain the number 12. - Fraction equality box
Write the assignment in a fraction. Fill in the number in the box so that the equality applies: (Write the result as a fraction in the base form.) (1 1/3 - 3/4) · ___ = 1/2 - Number square comparison
Calculate how many times the square of the number 1/100 is less than 1/1000. (numbers in fraction form) - Whole fraction determination It is given that 1 1/7 of the whole is 32. Determine what 2 1/4 of the total is. (One whole and one-seventh, two whole and one quarter).
- Triangle angle ratio
The sizes of the interior angles of the triangle are in the ratio of 3:4:5. Calculate these angles. - Terezka 2
Terezka has two younger siblings: 40-month-old Annie and 7-month-old Kája. ○ Calculate how many months it will take for Annie to be four times older than Kája. ○ Calculate the age difference between Tereza and Annie if Tereza celebrated her sixth birthday - A fan
A fan with a resistance of 20 Ω is connected to a power supply. The current flowing through the circuit is 2.5 A. What is the voltage of the power supply? - Angle of the sector
Find the angle of the sector of a circle radius of 20 units where the area is equal to the lateral area of a cone with a radius of 8 units. - A scale
A map scale states that every ¼ of an inch represents 20 miles. If two cities are 3½ inches apart, how many miles are actually between the two cities? - Consider 3
Consider the isosceles trapezoid PQRS. The bases are |PQ|=120 mm, |RS|=62 mm and the arm s=48 mm. Find the height of the trapezoid, diagonal length and the area of the trapezoid. - The noon-time
The noon-time temperature was 29 °F. It was 4 °F lower than predicted. Write and solve an equation to determine the predicted noon-time temperature. - Box cardboard material
The closed box has the shape of a perpendicular prism with the base of an equilateral triangle. The edge of the base is 24 cm long, and the height of the box is 0.5 m. Calculate how many square meters of cardboard are needed to make 20 such boxes, assumin - Beef burger resources
In the meat atlas published by the Jindřich Boll Foundation, it is stated that one kilogram of meat requires 6.5 kg of grain, 36 kg of feed mixture, and 15 cubic meters of water. Laura's slice of beef in the burger weighed 45 grams raw. How many kilograms - Consecutive number groups Determine the group of numbers for which the following relations hold: a) The sum of the searched three consecutive even numbers equals 978. b) The sum of the searched four consecutive odd numbers equals 312.
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