Math practice for 13 year olds - page 225 of 413
Number of problems found: 8260
- Trio ratio
Hans, Alena, and Thomas have a total of 740 USD. Hans and Alena split in the ratio of 5:6, and Alena and Thomas in the ratio of 4:5. How much will everyone get? - Temporary workers
Three temporary workers work in the warehouse and unload the goods in 9 hours. At what time would five temporary workers unload the same products? - Dessert purchase calculation
Mom bought desserts for her birthday party. The pinwheel cost CZK 14, and the Indian women CZK 11. She paid 201 crowns for 15 desserts. How many pinwheels did she buy, and how many Indians? - The gold coin The gold coin contains 900 permille of pure gold. The coin weighs 950g. How much permille is gold? How many grams are gold?
- Rectangular trapezoid ZIMA
I have a rectangular trapezoid ZIMA (the right angle at the top of Z. ZIMA = winter in English) ZI-7 cm, ZM-5 cm, AM-3.5 cm, and we have to write the procedure to construct this trapezoid. - Number ratio sum
Write the number 126 as the sum of three numbers whose ratio is 2:5:7 - Twenty-five
How many are three-digit natural numbers divisible by 25? - In the bakery
24 pieces of bread are baked in the bakery in 2.25 hours. How many breads are baked in the bakery in 6 hours and 45 minutes? - Coin savings calculation
Jana saves two-crown and five-crown coins. He has ten coins in the coffers. How many are two Czech crowns, and how many are five Czech crowns if he has saved CZK 29? - Eq triangle minus arcs
In an equilateral triangle with a 2 cm long side, the arcs of three circles are drawn from the centers at the vertices and radii 1 cm. Calculate the area of the shaded part - a formation that makes up the difference between the triangle area and circular - Triangle circle construction
The vertices of the triangle ABC lie on the circle k. The circle k is divided into three parts in a ratio of 1:2:3. Construct this triangle. - Clock hand angle
What is the angle of the clock hands: a / at 16 hours 15 minutes b / v 8 hours and 4 minutes - Gift wrapping paper
The sheet of wrapping paper measures 100 cm and 70 cm. Is it enough to wrap a gift in a block-shaped box with dimensions of 40 cm, 25 cm, and 20 cm? - Aquarium water calculation
A block-shaped aquarium with dimensions of 82 cm, 30 cm, at 7.6 cm is filled with 70% water. How many liters of water is in it? What height does the water reach? From what% of the sidewall area is wetting? - Mysterious area
The trapezoid ABCD is given. Calculate its area if the area of the DBC triangle is 27 cm². - Intelligence test
Paul, Jano, Charles, and Rick were taking an intelligence test. Palo correctly answered half of the questions plus seven, Jano to a third plus 18, Charles to a quarter plus 21, and Risho to a fifth plus 25. After the test, Charles said, "I feel I was doin - Mom son age
Mom is nine years older than her son. In 19 years, his son will be as old as his mother is now. How old is the mom, and how old is the son? - Twelve-position number system
Write the 12 largest five-digit numbers in the twelve-position system and the 12 smallest six-digit numbers. - Map scale calculation
On what scale is the map drawn? A 25 cm long line shows the actual distance of 1250 km. - Auto-tuning
During auto-tuning, the TV searched for 25 channels, four of which were music. The channels are stored in the TV's memory in random order. Express the percentage of the event that We will save the music channel first.
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