Maths practice for 12-year-olds - page 215 of 347
Number of problems found: 6930
- Reading book
If I read 15 pages daily, I will read the book in 20 days. How many pages do I have to read a day if I want to finish the book in 12 days? - Aquarium Water Level Area
There are 140 liters of water in a rectangular aquarium with 800 mm and 50 cm base dimensions. How high in cm does the water level reach? What is the area in dm² of the inner walls of this aquarium up to the water level? - Number multiplication puzzle
To get their sum, what number do you have to multiply the difference between 3 1/2 and 2 3/4? - Diamond - simple
Calculate the circumference and area of the diamond if the side is 5 cm long and the height is 3 cm long. - Kite paper purchase
The production of kites requires 12 square meters. The paper is 125 cm wide. How many meters of paper do we need to buy? - Reminder and quotient
Numbers A = 135 and B = 315 are given. Find the smallest natural number R greater than one so that the proportions R:A, R:B are with the remainder 1. - Car crash
After a traffic accident, police measured 1.16 permille of alcohol in the driver's blood. About 5 kg of blood circulates in the human body. What amount of alcohol did the driver have in the blood? - Circular arc length
The length of the circular arc at the corresponding angle of 120 ° is 8 cm. What is the size of the whole circle? What is its radius? - Caleb
Caleb is making lemonade for a party. He has 5 gallons of lemonade. He puts 1/3 cubic inch of lemonade in a cup for each guest. How many guests are going to be at the party? - Oven carrying weight
The inner radius of the oven is r1 = 15cm, the outer radius is r2 = 20cm, and the length is 227cm. Can one person take it if its material density is 2.8 g / cm cubic? - Inquality
Solve inequality: 3x + 6 > 14 - Milo lifted
Milo lifted 65 lb 6 times, and Jeremy lifted 50 lb 9 times. Which one lifted the most weight? - Container diameter calculation
What is the diameter of a cylindrical container if half a liter of water reaches a height of 12 cm? - Divide 5
Divide number 288 by the following ratio of 3:4:5. - Melting point
The melting point of mercury is -36°F, and its boiling point is 672°F. What is the difference between the boiling point and the melting point? - Find unknown Find an unknown numerator: 4/8 + _/8 = 1
- At a party
At a party 12 guests left their shoes in the hallway. In total there were 6 pairs of men's shoes, 6 pairs of women's shoes, 6 pairs of brown shoes, 6 pairs of black shoes. After the party it was found that some of the shoes had disappeared. 5 men's and 5 - Gas Air Weight Ratio
One m³ of air weighs 13/10 kg, and the same volume of natural gas weighs 4/5 kg. How many times lighter is the gas than air? - Block Volume Surface
Calculate the volume and surface of a block 3 cm wide, 6 cm long, and 8 cm high. - Cupcakes 2
Susi has 25 cupcakes. She gives 4/5. How much does she have left?
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