Maths practice for 12-year-olds - page 143 of 353
Number of problems found: 7041
- Two dice
What is the probability that when the roll of two identical dice is the sum of points 7? - The diameter
The cone's diameter is 24 cm, and the radius is 12 cm. How many cm does height measure if it is one-third larger than the radius of the cone? - Trapezoid complete
Calculate side b and the height of the trapezoid if a = 5.1 cm; c = 6.8 cm; d = 4.7 cm; circumference is 21 cm, and the area is 17.85 cm². - Cylinder volume rectangle
We rolled up the shell of a 4 cm high rotating cylinder from a rectangle measuring 6 cm and 4 cm. Find the volume of the cylinder. - Glass pendant weight
Calculate the weight of the pendant - a regular four-side prism made of glass. The density of the glass is 2.5 g / cm3, the edge of the base is 2 cm, and the height of the pendant is 5.5 cm. - Diesel tank level
The diesel tank is shaped like a block measuring 4.5 m x 3.2 m. If it contained 216 hl of diesel, what was its level? - Trapezoidal prism surface
The prism with a trapezoidal base has the dimensions of the base a = 10 cm, b = d = 5 cm, c = 6 cm, the trapezoid height is 4.6 cm, and the height of the prism is 30 cm. Calculate its surface. - Minute hand
What is the distance the clock's minute hand travels in 12 minutes if the clock's diameter is 30 cm and the hand extends to a distance of 2 cm from the edge of the clock? - Perimeter of rhombus
The area of the rhombus is 32 cm². One side measures 10 cm. The height on the other side measures 5 cm. What is the perimeter of this rhombus? - Granite ball
The granite ball has a diameter of 80 cm. The mass of 1 m³ of granite is 2900 kg. What is the mass of the ball? - Ratio difference product
Find the product of the ratio and the difference between the numbers 16/3 and 3.2 - Candy fraction sharing
Dana had 48 candies and offered them to her friends. Anna took a third, Bety a sixth, and Charlotte an eighth of all sweets. How many candies did she take? - A fraction
I think of a fraction. If we increase its numerator and denominator by one, the value of the fraction increases by one-tenth. What fraction do I think? - Birthday party
Jay brought two pizzas for his birthday party. At the birthday party, they eye 1 4/7 pizzas. What's the fraction of pizzas they have left? - Right triangle perimeter
Calculate the perimeter and the area of a right triangle if a = 6 cm, b = 8 cm, c = 10 cm. - Karel money puzzle
Carl said to George: If you had 50 Euros less than twice the money I had with me, you would have 10 Euros more than I did. How many Euros did Carl have? - Carpet floor area
The carpet covers 8 m² of flooring, which is one-third of the entire floor area. How big is the whole floor? - Plasticine cube weight
How many grams of plasticine do we need to model a cube with an edge of 150 mm if 1 cm³ weighs 2.1 g? - The dice Find the probability that a number divisible by two or three will fall when the dice are rolled.
- Wagon press weight
They shipped a press from the factory. The wagon with the press weighed 18 tons. The empty wagon is twice as heavy as the press. How many tons does the press weigh?
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