Math practice for 13 year olds - page 176 of 428
Number of problems found: 8558
- Ratio of triangles areas
In an equilateral triangle ABC, the point T is its center of gravity, the point R is the image of the point T in axial symmetry along the line AB, and the point N is the image of the point T in axial symmetry along the line BC. Find the ratio of the areas - Base of percentages
7% of the base is 35 kg. What is 39% of that base? - Ton percentage
What percentage is 119 t of 85 t? - Base percentage
40% of the base is 1200. Determine what the base is. - Number by percentages
Increase the number 250 by 11%. - Percentage comparison
What is more, 14% of 27 or 15% of 28? - Two identical five-digits
We have two identical five-digit numbers, but we don’t know which ones. When we write one before the first, and after the second one, we get two six-digit numbers, one of which is three times the other. What are the numbers? - Cardboard - boxes
The closed cardboard box has the shape of a block measuring 25 cm, 1.2 dm, and 0.5 m. How much cardboard is needed to make 20 such boxes? You need to add 5% to bends. - Quadrilaterals
Which of the following statements about angles in quadrilaterals is false a. In a right-angled trapezoid, exactly one interior angle is obtuse. b. The diagonals of a rhombus are right angles. c. The sum of the measures of any two interior angles in a para - Squares above sides
In a right triangle, the areas of the squares above its sides are 169, 25, and 144. The length of its longer leg is: - Metal sheet
Calculate how much sheet metal is needed to make a closed block-shaped container with dimensions of 2 m, 7 m, and 9 m if we must add 12% to the welds. - The pool
The pool is 25 meters long, 10 meters wide, and 1.5 meters deep. How many liters are needed to fill it completely? How much will the new floor and wall paneling cost if one m² costs 10 euros? - Stationery sales average
Monday. 668 euros Tuesday. 624 euros Wednesday. 816 euros Thursday. 584 euros Friday. 826 euros The table records sales in the stationery store during the working days of one week per month. If the average daily sales during the weekend were 860 euros, by - Cylindrical tank
A tank has the shape of a cylinder with a diameter of 1.6 m and a length of 4.5 m. At least how many cylindrical barrels with a diameter of 0.8 m and a height of 1.5 m are needed to empty a tank? - Latitude and longitude
A helicopter is flying from Hong Kong to Jakarta. The latitude of Jakarta is -6.20, and its longitude is 106.80. The latitude of Hong Kong is 22.27, and its longitude is 114.15. What is the helicopter net change in latitude and longitude as it travels fro - The mountain hut
The mountain hut has a supply of food for eight tourists for 15 days. Half more were come. How long will their food supply last if the daily ratio remains the same? - Shopping meeting
Katka left the store with a heavy purchase at a constant speed of 0.5 m/s. Her brother Michal ran to help her at a constant speed of 3.25 m/s. How many meters did Katka have to walk with her shopping before meeting Michal if the store is 300 m from the ho - What is 10
What is the measure of the square side whose area is (4x² + 28x+49) square units? - The diagonals
The diagonals of the KOSA diamond are 20 cm and 48 cm long. Calculate the circumference of the diamond in centimeters rounded to one unit. - Cube half
How much is half the half the cube half?
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