Math practice for 13 year olds - page 123 of 421
Number of problems found: 8415
- Children's room
The children's room is a square with a side of 3m. What is the area of the room layout on a 1:50 scale plan? - Travels 63514
The cyclist travels 10 km per hour, car 60 km. The cyclist went for 3 hours. How many minutes does the same journey take to a car? - Quarter 63494
There were 15 apples in the basket. There were four fewer red apples than green ones and a quarter fewer reds than red ones. How many red apples were in the basket? - Estefania
Estefania bought a video game player. She does not remember the price before tax. She does know that the 6% sales tax came to $4.80. To find the price of the game player, she drew a percent bar or tape diagram. What was the price of the game player before - Probability 63434
There are tickets with the numbers 1, 2, 3, 4, 5, 6, 7, and 8 in the envelope. Two tickets are drawn from the envelope at a time. What is the probability that the sum of the numbers drawn will be 7? Write the result as a decimal rounded to hundredths. - Remaining 63364
Juraj pays from a monthly pocket quarter for a snack, a fifth for drinks, and a third for technical details for a PC. He saves the remaining 13 euros. What's his monthly pocket money? - Kilometers 63354
The car will travel 154 km in 2.24 hours. How many kilometers will he travel at the same speed in 3.2 hours? - Calculating 63344
Calculate the volume of the cone formed by rotating an isosceles triangle about the height of the base. The triangle has a side length of 15 cm and a height to the base of 12 cm. When calculating, use the value pi = 3.14 and round the result to one decima - Probability 63324
The shooter fired 100 times on the ground. He had four times more successful hits than failed hits. What was the probability of a hit in percent? - Gradually 63314
The fishery gradually sold carp weighing 2 1/2 kg, 1 5/6 kg, 1 3/5 kg, 2 1/10 kg, 2 kg, and 2 2/3 kg. What was the average weight of 1 carp? - Probability 63304
One hundred fifty pupils go to the 9th year of primary school. Of these, 66 have no siblings, 39 pupils have one sibling, 18 pupils have two siblings, and the remaining pupils have more siblings. What is the percentage probability that a randomly selected - Sequentially 63274
In the pocket, there are six tickets marked with numbers 1 to 6. How many ways can we sequentially, taking into account the order, select 3 of them if the chosen tickets do not return to the pocket? - Direction 63264
A railway car weighing 10 t moves around the Earth at a speed of 10 m/s. Determine the kinetic energy of the car relative to the Earth and relative to another car moving at a speed of 10 m/s relative to the Earth, both in the same direction and the opposi - Triangle 63244
The area of the ABCD square in the picture is 36 cm². Points E and F are the centers of the square BC and CD sides. What is the area of the triangle AEF in cm²? - Volume 63234
The cube with a volume of 216 l has an edge with the following: - Unknown 63224
You will find an unknown number on the number line between 428 and the unknown number 290. - Original 63184
If you reduce the unknown number by 90, you get 88% of its original value. Specify this unknown number. - Hundredfold 63144
The length of the radius of the rotating cylinder base is 5 m. You calculate the radius of an equally high cylinder, the volume of which is a hundredfold. - Sidewalk 63134
A 2m wide sidewalk is built around the circular fountain. The radii of the circles that delimit the path on both sides are 4:3. What area in square meters does this sidewalk occupy? - Kilometers 63124
At 10:00 AM, a car started from place A at a speed of 70 km/h. 0.5 hours later, a car started from the same point at a speed of 100 km/h. What time did they meet? How many kilometers from point A did they travel before they met?
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