Maths practice for 12-year-olds - page 299 of 348
Number of problems found: 6960
- Angles of a triangle
In triangle ABC, the angle beta is 15° greater than the angle alpha. The remaining angle is 30° greater than the sum of the angles alpha and beta. Calculate the angles of a triangle. - Bottles
Mrs. Violet brewed 15 l of raspberry juice. She poured it into 17 bottles. Some were 3/4 liter and someone liter. How many bottles were of these two types? - Is right triangle
One angle of the triangle is 36°, and the remaining two are in the ratio of 3:5. Determine whether a triangle is a rectangular triangle. - Sum and rounding
I know two numbers whose sum is 20. When each round and then added together, I get the 30. What are these numbers? - Roses
In a large bed of roses, one-sixth were white, half were red, one-quarter were yellow, and six were pink. How many roses were in the flower bed? - Shell of cylinder
Calculate the area of the shell of the 1.6 m height cylinder with a base radius of 0.4 m. - Circle area
Calculate the circle area with a radius of 1.2 m. - Circumference 2951
What is the radius of a circle with a circumference of 28 cm? - Radius and height
Calculate the volume of the cylinder: r = 5 cm, h = 9 cm - Calculate 2948
Calculate the length of a circle with a diameter of 7 cm. - Calculate 2946
The block's surface area is 94 cm². The lengths of its two edges are a = 3 cm and b = 5 cm. Calculate the length of its third edge. Let's say: From the formula for the block surface, first calculate c. - Cylindrical 2945
The cylindrical plastic container has a bottom diameter of 2 dm. How tall must the container be to hold 5 liters of water? - Determine 2944
Determine an unknown number. Its double is equal to its triple less 1.5. - Perimeter of circle
Calculate the circumference of a described circle to the triangle with sides 9,12,15 cm. - Dependence 2927
Sound travels in the air at a speed of about 330 m/s. Make a table of the dependence between the time (after one second), and the sound's distance travels during this time. During a storm, you can easily find out how far you are from it. - Even / odd numbers
a / Using variable n, write two consecutive odd numbers. b / The sum of three consecutive odd numbers is 333. What are these numbers? - Moneys in triple ratio
Milan, John, and Lili have a total of 344 euros. Their amounts are in the ratio of 1:2:5. Determine how much each of them has. - Ages
John, Teresa, Daniel, and Paul have a summary of 56 years. Their ages are in a ratio of 1:2:5:6. Determine how many years each has. - Square - increased perimeter
How many times is the increased perimeter of the square, where its sides, increased by 150%? If the perimeter of the square increases twice, how much % increases the area of the square? - Tripled square
If you tripled the length of the sides of the square ABCD, you increased its area by 200 cm². How long is the side of the square ABCD?
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