Maths practice for 12-year-olds - page 239 of 348
Number of problems found: 6954
- Hectoliters 6166
In 1 minute, the human heart pumps an average of 5 liters of blood. How many hectoliters will be pumped a) in 1 day and b) in 1 year? - Seven
Seven friends agreed to send everyone a holiday card. How many postcards were sent? - Report 2
A School reports students to teacher ratio of 6:1. If there are 45 teachers in the school, how many students are there? - Surface area 6156
The area (surface of the shell) of the cube is 93 cm². What is the volume of the cube? - Simple sequence
Continue with this series of numbers: 1792,448, 112, _, _ - Dinosaurs
More than 30 and less than 60 dinosaurs have met at the pond. A quarter of them bathed, and 1/7 saws and the rest gripped. How many were at the pond? How many were there? - Two discounts
The MP4 player cost 960 CZK, and the price was twice gradually reduced in the ratio of 4:3:3/2. How much did the player cost after the second discount? - Pedestrian 6146
A pedestrian met Street Math and asked him what time it was. "Add half the time to midnight to a quarter of the time, and you'll get the exact time." What time was it? - Motorcyclist 6145
The cyclist covered a certain distance in 6 hours and 15 minutes. How long will it take for a motorcyclist to travel five times more if he travels three times faster? - Calculate 6144
Calculate in dm² the surface of a quad whose edges have 1.2 dm, 1.4 dm, and 2dm. - Twenty
Twenty rabbits are put in 4 cells so that there are a different number of rabbits in each cell containing at least three rabbits. What is the largest possible number of rabbits in one cell? - Dropped sheets
Three consecutive sheets dropped from the book. The sum of the numbers on the pages of the dropped sheets is 273. What number has the last page of the dropped sheets? - Quadrilateral 6138
What is the tent's height in the shape of a regular quadrilateral pyramid, whose volume is three dm³ and the base has an area of 6 dm²? - Exactly 6134
At what average speed does a car have to travel to drive 55 km in exactly half an hour? - School 6127
The gym at the school is 12 m wide and 1800 cm long. Draw it on a scale of 1:500 - Strawberries 6125
Friends Marika and Katka decided to prepare strawberry jam together according to the recipe. They needed 50g of sugar for 0.5kg of fruit. How many kilograms of sugar must the friends prepare if they make jam from 2.3 kg of strawberries? - Calculate
Calculate the area cm² diamond with a side length of 9.8 cm and a height on the side of 5 cm. - Naturally 6121
The ratio of the two natural numbers is 2:3. The smaller natural number from this pair is 12. Calculate the larger. - The well
The well has the shape of a cylinder with a diameter of 2 m. From ground level to water level are 4 meters, and the water depth in the well is 6 m. How many m³ of soil did they dig when digging a well? How many liters of water are in the well? - How much
How much money will we pay for 20 planks 4m long, 15cm wide, and 26mm thick when 1m³ of wood costs 4500kč?
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