Maths practice for 12-year-olds - page 90 of 355

Number of problems found: 7081

Number divisibility nine
What digit should X replace so that the number 6X94 is divisible by nine?
ABC gifts
Arthur had 30 dollars to spend on three gifts. He spent 9 3/4 dollars on gift A and 4 1/2 dollars on gift B. How much money did he have left for gift C?
Cone volume surface
Calculate the volume and surface area of the cone with a diameter of 20 cm and a height of 15 cm.
Number ratio division
Divide the number 34 in the ratio of 3:4:10.
Three-digit number creation
From the number 5,4,0,7,8, create three-digit numbers, so they do not repeat and solve the problem by calculation.
Car's mileage
A car owner has her tank filled and notices that the odometer reads 14,368.7 kilometers. After a trip in the country, it takes 34.5 liters to fill the tank, and the odometer reads 14,651.6. How many kilometers per liter is this car getting?
Triangle perpendicular perimeter
The perimeter of a right triangle is equal to 30 centimeters. Calculate the perpendicular b if a = 5 centimeters and c = 13 centimeters. A natural number expresses the length of the perpendicular b.
Centi-year deca-month comparison
How many minutes is the centi-year longer / shorter than a deca-month? The year is 365 days, and the month is 30 days.
Two boxes 2
The students filled two boxes with 5-peso coins. Box A has 300 5-peso coins, and Box B has 450 coins. In what way is the volume of box A lesser or smaller than the volume of box B? Explain your answer.
Wooden prism
The wooden prism weighs 5 kg and has a 700 kg/m³ density. Calculate the volume of the wooden prism.
Woman language employees
The company has 120 employees, two-thirds of whom are women. Of the women, only a quarter speak both English and German. How many women talk in English and German?
Reecha
Reecha has a picture frame that is 13 1/2 inches wide. How many pictures that are 3 3/8 inches wide can be placed beside each other within the frame?
Shirt short combinations
Dušan has 8 T-shirts and three pairs of shorts in his closet. How many ways can he dress for school?
A person
A person buys 10 kg of commodity A at a rate of 2 kg per dollar, 20 kg of commodity b at a rate of 5 kilograms per dollar, and 30 kg of commodity C at a rate of 10 kg per dollar. Find the average price of kg per dollar.
Square rectangle area
Task 1 - The circumference of the square is 280 mm. What is its area? Task 2 - the perimeter of the rectangle is 44.6dm, and its width is 6.3dm. Calculate the area of this rectangle.
Sphere - diameter
What is the diameter of a 1m³ sphere? Write in decimetres
American stars
Some movie stars are very well paid. Actor Leonardo DiCaprio received a fee of 20 million US dollars for the main role in the film. In this film, which lasts 125 minutes, there is also a short scene in which DiCaprio takes 6 seconds to put on his boots. H
The quantity
Find the quantity of six times 3 1/2 over 2.
A capacity
Suppose the cylinder at the right holds a capacity of 2 205 cm³ and its base area of 105 cm². How high is the cylinder?
Relay 2
Marco Racer's best time in the 100-yard relay is 15 1/4 seconds. How many seconds would it take him to run 450 yards at the same rate?

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