Math practice for 13 year olds - page 143 of 415
Number of problems found: 8284
- Student commute percentage
There are 25 students in the class. Four students commute. How much percents is it? Please help quickly. - Goods price reduction
They reduced the goods by 15% from the original price of CZK 3,400. What is the new price? - Cube-shaped box
The cube-shaped box with a length of 20 dm is filled with sand. If 1 m³ of sand weighs 1.5 t, what is the weight of sand? - What is
What is the circumference of an isosceles trapezoid with an area of 106.75 cm²? The lengths of the sides are in the ratio of 1:3:2:1, and the bases are 6.1 cm apart. - Tractor
A car traveling at a speed of 70 km/h is overtaken by a tractor traveling at 25 km/h. The driver of the car needs a toilet and knows that it will take him 3 minutes. How many kilometers does the car have to cover, so the tractor does not overtake it? - Production plan
The annual production plan was exceeded by 2%. If production were higher by 300 products, the plan would be exceeded by 5%. What was the annual production plan? - Purchased
Milo shopped in a store where the prices of all goods were listed in whole euros. If Milo bought 2 milks, 3 glasses, and 1 pack of sweets, he would pay €49. If he bought 5 more milks, 11 glasses, and 1 pack of sweets, he would pay €154 in total. How many - An experiment 2
The temperature of a substance in an experiment changes by -8.7 °F from 10 AM to 1 PM. At 5 PM, the temperature is 33.5 °F, which is 2/3 of what it was at 1 PM. What was the temperature of the substance at 10 AM? - Number difference puzzle
I am thinking of a number. The difference between nine times and four times the unknown number is 625. What number am I thinking of? - Rectangle area dimensions
We are to create a square in the shape of a rectangle with an area of 288 m² (square) so that the sides are whole numbers. What are all the dimensions of the rectangular box we can make? How many is the solution? - Remainder 4
After giving eight apples to her friend, Juliet noticed that ⅔ of the remainder were 12. Thus, she had a total of eight apples. - Gasoline fuel 2
Mike's monthly fuel budget is 2000.00, and he saved the rest. At the end of the month, he checked his gasoline slips and found he had used the following amounts of gasoline: 9.71 liters,10.23 liters,17.8 liters,6.31 liters, and 8.47 liters. If a liter cos - The train
The train starts for 2 min with an acceleration of 25 cm/s². What speed will he gain in this time, and what path will he pass? - Trisection of a line segment
Divide the line segment AB into three equal parts. Instructions: Construct an equilateral triangle ABC and find its center (e.g., the described circles). - Aircraft acceleration trajectory
The aircraft, which has a speed of 1080 km/h, starts moving for 1 minute with an acceleration of 1 m/s². What will be its final speed? What trajectory will he take at this minute? - Powdered milk A can of powdered milk and a can of evaporated milk cost $83.90 together. Two cans of evaporated milk and a can of powdered milk cost $118.05. How much is one can of powdered milk? How much is one can of evaporated milk?
- A rectangle 8
A rectangle measuring 6 cm and 4 cm is enlarged by the ratio of 3:1. What is the area of the enlarged rectangle? - Dam building hours
Twenty men will build a dam in 36 days if they work 10 hours daily. How many hours a day do 30 men have to work if the embankment is to be completed in 16 days? - Three-digit divisible nine
Determine the number of all-natural three-digit numbers divisible by 9, consisting of the numbers 0, 1, 2, 5, 7: - Change per hour
On Sunday, the temperature was 63 degrees at 2 PM. The temperature was then 72 degrees at 5 PM. What is the rate of change per hour?
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