Math practice for 13 year olds - page 291 of 420

Number of problems found: 8399

Circle diameter
The span of the arc is 247 cm, and the height of the arc is 21.5 cm. What is the diameter of the circle?
Cars Meeting Speed
At 10:00 AM, two cars drove against each other from places 240 km away. One was driving at an average speed of 70 km/h. What was the speed of the other when they met at 11:30?
Number Three Quarters Greater
Find the number whose three-quarters is five more than its one-third.
Parallelogram - sides
One side of a parallelogram is 8 cm long, which is two-sevenths of its perimeter. Calculate the length of the other side of the parallelogram.
Kinetic Energy Braking Force
Johnny is skating at a speed of 18 km/h. His kinetic energy is 0.5 kJ. Johnny weighs 40 kg. Calculate: 1. What work will the braking forces do before Johnny stops? 2. What is the braking force if Johnny stops after covering a distance of 14 m?
Two unknown numbers
One number is two less than a second number. Twice, the second number is 14 lower than five times the first. Find the two numbers.
The iron roller
The iron roller has a base circumference of 28 π cm. The worker drilled a hole through the top of the roller. After drilling, the given product had a 35% smaller volume than before. The hole's circumference in the base is equal to the height of the roller
Grain harvest
The farmer harvested 300 tons of grain, of which 18 tons were barley, wheat was 250% more than oats, and rye was 40% more than wheat. How many tons of individual grains did he harvest?
Hunt catch
Hunters shot the same number of pheasants as hares on the hunt. Together, they had catches of 408 feet. How many hares were there? (Suppose no animal was handicapped.)
Class Boys Girls Ratio
There are 21 students in the class, two times more boys than girls. How many boys and how many girls are in the class?
Seamstress
The seamstress cut the fabric into three parts. The first part was the eighth fabric, the second part was three-fifths of the fabric, and the third part had a length of 66 cm. Calculate the original length of the fabric.
Dress discount
The dress was reduced from CZK 840 to CZK 651. Calculate what percentage they have been discounted.
A truck
A truck left Znojmo at 7 am. He drove to Ostrava at an average of 56 km/h. 15 minutes later. A car went out of Ostrava at the same route from Znojmo at 64 km/h. What time did both vehicles pass and at what distance from Znojmo, if you know that the road d
Two-Digit Numbers Multiply Four
Write how many double-digit numbers there are, which, if we multiply by four, we get the result ending in two zeros.
Pool filling
How many hours will a block-shaped pool measuring 24 m, 12 m, and 1.8 m be filled if it flows through a 9 cm diameter pipe at a speed of 2.5 m/s?
Diamonds puzzle
The puzzle is composed of paper diamonds. One diamond (rhombus) has a diagonal 3.4 cm long and a corresponding height of 2.5 cm. How much paper in dm squared is needed for 60 diamonds?
Rhombus Parquet Room Area
The parquet floors in the room have the shape of a rhombus with a side of 2.5 dm long and a corresponding height of 0.8 dm long. How many square meters does a room have if its floor is made of 600 parquets?
Cube changes
How much percent will the surface and volume of the cube decrease if the diagonal decreases by 10%? b) if the diagonal increases by 10%?
Cube edge
The cube has a surface area of 110.6 cm². Calculate the length of its edge.
T-shirts and hat
Five T-shirts and a hat cost £62.00 Two T-shirts and a hat cost £29.00 How much does a T-shirt cost? How much does a hat cost?

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