Math practice for 13 year olds - page 115 of 428

Number of problems found: 8555

Apple average weight
The basket contains five red apples with an average weight of 125 grams and one yellow apple. The average weight of all apples in a basket is 120 grams. Determine the weight of the yellow apple in grams.
Circle chord distance
The figure shows the circles k₁(S₁; r1=9 cm) and k₂(S2; r2 = 5 cm). Their intersections determine a common chord t 8 cm long. Calculate the center distance |S₁ S₂| in cm to two decimal places.
Temperature - change
The thermometer showed -2 °C in the morning. By lunch, the temperature had risen by 5°C. The temperature had dropped by 13°C till midnight. What temperature in °C did the thermometer show at midnight?
Mark Argie
Mark Argie has P11.50 more than Erwin. Together, the two boys have P131.50. How much does Mark Argie have?
Fertilizer water proportion
0.6 l of fertilizer goes to 40 l of water. How much fertilizer should be put in per 10 liters of water?
Which 9
Which of the temperatures is the coldest? A.100 degrees Celsius, B.373 degree Kelvin, C. 32 degrees Fahrenheit.
Grandma 9
Grandma bought 2 kilograms of apples at a crowns per kilogram, 5 kg of potatoes at b crowns per kilogram, and one celery for 12 crowns. She paid with three fifty crowns. o Depending on the quantities a, b, express the amount in crowns that was returned to
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?
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 Anička and 7-month-old Kája. o Calculate how many months it will take for Anička to be four times older than Kája. o Calculate the age difference between Tereza and Anička if Tereza celebrated her sixth birth
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.

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