Maths practice for 12-year-olds - page 246 of 347

Number of problems found: 6932

Mixture
How many percentage mixtures do we get by adding 23 ml of matter to 89 ml of water?
Washing Powder Duration
Andrew found that three-quarters of a bag of washing powder was used up by his family in 12 weeks. How many more weeks will the remaining powder last? How long does a whole bag of washing powder last?
Mothers and Benches Puzzle
When the mothers sat down on the benches at the Christmas gazebo, only one mother sat on the last bench. When the six of them sat down, one mother remained standing. How many mothers were there on the gazebo, and how many benches could they sit on?
Two annuluses
The area of the annular circle formed by two circles with a common center is 100 cm². The radius of the outer circle is equal to twice the radius of the inner circle. Determine the outside circle radius in centimeters.
Bus Route Length
The long-distance bus driver went 2/5 of the route length in the morning and 1/3 of this length in the afternoon. He still has 60 km to the finish. How long is the long-distance bus route?
Mother and Child Age
A mother is 21 years older than a child. In 6 years, the mother will be five times more than the child. Question: Where's Dad?
Number with ones
The first digit of the number is 1. If we move this digit to the end, we get three times the higher number. What is the number?
Orchard
One-eighth of the trees in the fruit plant in winter froze, and one-twelfth were damaged by disease and pests. Healthy trees remained 152. Is it enough to supply 35 trees to restore the original number of trees in the orchard?
Speed Conversion Meters Seconds
The car travels at a speed of 20m/s. At what speed does it travel at km/h?
Wind Speed Conversion
When it is said that the wind blows 25 m/s, how much km/h blows?
Students Travel to School
How do pupils travel to school? 2/7 uses a trolley bus, 1/5 drives, and the remaining 136 pupils walk. How many pupils are there at school?
Drawer
The rectangular face of a drawer has a perimeter of 108 cm and a width of 18 cm. Find the length and the area of the rectangular face of the drawer.
Water block
A block with a 50 cm² base is filled with water 5 cm under the edge. How many sugar cubes with a 2 cm edge can be thrown into a container that overflows with water?
Grandfather and grandmother
The old mother is five years younger than the old father. Together, they are 153 years old. How many years has each of them?
Two trains
There were 159 freight wagons at the railway station creating two trains. One had 15 more wagons than the other. How many wagons did each train have?
Electric current calculation
Calculate how much electric current flows through the circuit if a 3 C (C is SI unit - Coulombs) electric charge passes through the conductor cross-section in 30 seconds.
Bulb Current Resistance Calculation
The bulb is connected to a 4.5 V power supply. An electric current of 45 mA flows through the filament of the bulb. The calculated size of the electrical field of the filament lamp
Electrical Voltage Calculation
A resistor with an electrical resistance of 1.5 kiloohms passes through an electrical current of 0.1 amps. Calculate the electrical voltage between the resistor terminals
Coil as a girl
The electrical resistance of the copper wire coil is 2.0 ohms. What current runs through the coil when the voltage between the terminals is 3.0 V?
Coulombs
How long does it take for a 15 C charge to cross the conductor's cross-section if a 3 mA current passes through the conductor?

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