Maths practice for 12-year-olds - page 350 of 354
Number of problems found: 7075
- Diagonal
Can a rhombus have the same length, diagonal, and side? - Chord
The point on the circle is the endpoint of diameter and endpoint of the chord length of the radius. What angle between chord and diameter? - Numeric question
Is it possible a negative, irrational number? - Aircraft
Flight length 2886 km took 4 hours. The airport passengers had to arrive hours in advance, 2 hours. Departure was delayed for 2.3 hours. The destination airport formalities took 0.5 hours. Calculate the average speed of passenger travel from arrival to le - Number
Is number 2.8814789 irrational? - Ratio v2
Decrease in the ratio 8:16 number 20.2. - Ratio Increase the number 25.6 in the ratio 7:4.
- Trunk
Calculate the length of the biggest fishing rod that can be inserted into the trunk of a car with dimensions 152 x 82 × 81 cm. - Box
Calculate the angle between box base 5 x 10 and body diagonal length 13. - Observatory
The observatory dome has the shape of a hemisphere with a diameter d = 10 m. Calculate the surface. - Rotating cone
Calculate the volume of a rotating cone with base radius r=18 cm and height h=20 cm. - Is right?
Is a triangle with sides 15, 66, and 68 right triangle? - Average
The average of 5 numbers is 108. What is its sum? - Rectangles
How many rectangles with area 8855 cm² whose sides are natural numbers? - Minute angle
Find the size of the angle, which takes a minute hand for 30 minutes. - Guess number
With what number should be divided, number 10387 to be reduced by 30%? - Secret number
Find the secret number n, which reversed decreases by 15.4 if the number increases by 15.4. - Clock
How long is the trajectory of the second hand of hours for day, if it is 15 mm long? - Earth parallel
Earth's radius is 6377 km long. Calculate the length parallel to latitude 75°. - Tree trunk
Calculate the average tree trunk with a circumference of 192 cm.
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