Maths practice for 12-year-olds - page 204 of 351

Number of problems found: 7018

Bag of peanuts
Joe eats 1/3 of a bag of peanuts, Mark eats 1/4 of the remaining peanuts, Alvin eats 1/2 of what remains after Mark, Peter eats 10 peanuts, and 71 peanuts are left. How many peanuts were in the bag originally?
Missing number
Blank +1/6 =3/2; find the missing number.
Aquarium
I have an aquarium that is 100 cm long and 40 cm wide, and 40 cm in height. We fill it with water. How much will it weigh?
Examination 2
A teacher awards two marks for every correct answer and subtracts a mark for every wrong answer in an examination. If there were 20 questions and a child scored 25 marks, how many correct answers did the child get?
80 students
Eighty students were asked what type of test they preferred. Fifty students said they liked multiple choice, and 42 liked true or false. If 36 liked multiple choice and true or false types, how many students preferred multiple choice only?
Prism cubic meter
How many square prisms with a side of 100 mm and a total length of 4,000 mm can fit in one cubic metre?
Ratio of volumes
If the heights of two cylindrical drums are in the ratio 7:8 and their base radii are in the ratio 4:3. What is the ratio of their volumes?
The perimeter 3
The perimeter of a rectangle is 35 cm. The length ratio to its width is 3:2. Calculate the rectangle's dimensions.
Chester
Chester has a piece of wood measuring 1 2/3 cm. He needs to cut it into pieces measuring 3/4 cm long. How many pieces of wood did Chester cut?
A jewelry
A jewelry store has 20 grams of gold. How many grams are not used if a pair of earrings need 1/4 gram of gold?
Player selection probability
From the group of 18 players I am, the coach selects nine players. What is the probability that I will be among the players chosen?
Cube water drainage
In a minute, 100 l of water flows out of a cube with a volume of 1000 m. How long will it take to empty?
Temperature difference 2
The temperature in London on New Year's Day is -2 degrees Celsius. The temperature in Prague on the same day is -14 degrees Celsius. What is the temperature difference between the two cities?
Circle circumference diameter
The circle's circumference is 321 dm larger than its diameter. What is the diameter?
Temperature difference
Libya's highest temperature was recorded at 58 degrees Celsius, and the lowest was recorded at -88 degrees Celsius. What is the temperature difference?
Two Cars Chase Distance
At 10 a.m., a passenger car left Pardubice toward Chomutov at a speed of 65 km/h. A passenger car drove in the same direction at 10:30 a.m. at an average 75 km/h speed. The distance between Pardubice and Chomutov is 250 km. When will the second car catch
Cracked aquarium
Martin wanted to glue together an aquarium with his father's help. In the manual he read that it should have a volume of 45 litres. On the table he did not have much space. The bottom of the aquarium could have dimensions of only 25 cm and 40 cm. How tall
Minutes - decihour
John ran the track for one decihour. How many minutes did he run?
Garage painting calculation
How much paint does Peter use to paint a block-shaped sheet metal garage (without the lower base) with dimensions of 8 m, 5.5 m, and a height of 2.5 m, if 1 kg of paint is enough for a 4 m square area?
How high
How high does a prism with base dimensions of 1.7 dm and 5 dm reach if 1032 dm cubic will fit?

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