Math practice for 13 year olds - page 181 of 414
Number of problems found: 8280
- 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 perpendicular to each other. c. The sum of any two interior angles on the sa - 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. - True and false
A circle k(S; 8 cm) is given. Furthermore, points K, L are given such that the following holds: the length of SL is 6 cm, the length of SM is greater than 8 cm. Which of the following statements is not true a. The circle m(M; |ML|) has exactly two common - 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
A mountain hut has a food supply for 8 tourists lasting 15 days. Half as many more tourists arrive unexpectedly. How long will the food supply last, assuming the daily ration per person remains the same? - Shopping meeting
Kate left the store with a heavy purchase at a constant speed of 0.5 m/s. Her brother Michael ran to help her at a constant speed of 3.25 m/s. How many meters did Kate have to walk with her shopping before meeting Michael 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 of half of half of a cube? - The storm
After the storm, the top of the 5 m high mast deviated by 1 m from the original vertical axis. What is the peak now? Round to 2 decimal places. - Cuboid - ratio
Find the volume of a block whose dimensions are in the ratio 2:3:4 and the surface is 117 dm². - Squirrels
The squirrels discovered a bush with hazelnuts. The first squirrel plucked one nut, the second squirrel two nuts, and the third squirrel three nuts. Each new squirrel always tore one nut more than the previous squirrel. When they plucked all the nuts from - The base 2
The base diameter of a right cone is 16 cm, and its slant height is 12 cm. A. ) Find the perpendicular height of the cone to 1 decimal place. B. ) Find the volume of the cone, and convert it to 3 significant figures. Take pi =3.14 - Cyclist travel time
The cyclist will travel 22 km in an hour and a half. How long would it take to drive 30 km?
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