Maths practice for 12-year-olds - page 303 of 359
Number of problems found: 7168
- 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? - Grade average - insufficient
Classes are compared by achievement. In classes 3.A and 3.B the following grades were achieved in the subject of statistics. grade number of grades 3.A number of grades 3.B excellent 4 6 very good 10 11 good 12 9 satisfactory 5 4 insufficient 2 4 Which cl - 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. - Circle radius
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 - Circle diameter
What is the diameter of a circle with an area of 35 cm²? - Circle length
Calculate the length of a circle with a diameter of 7 cm. - Block edge
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. - Container height
The cylindrical plastic container has a bottom diameter of 2 dm. How tall must the container be to hold 5 liters of water? - Unknown number
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. - Sound travel
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? - Unknown number
Determine the unknown number, which doubles its fourth square and is equal to the fifth square. - Moneys in triple ratio
Milo, 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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