Math practice for 13 year olds - page 413 of 419
Number of problems found: 8372
- Euler problem
Someone buys 720 tolars towels. If it were for the same money of 6 more towels, it would be 6 tolars cheaper each. How many towels were there? - Binomials
To binomial 36x²-168x, add a number to the resulting trinomial be square of the binomial. - Powers
Is it true for any number a,b,c,d equality:? (a-b-c-d) 6 = (d+c+b-a) 6 - Is equal
Is it equal following terms? -9 21 = (-9) 21 - Rectangular field
One dimension of the rectangular field is 168 m greater than the second dimension. If each side of the rectangle increases by 9 m increases, the surface field is 2187 m². Find dimensions of the field. - Determine the number
Determine the number x that x+8 is (7)/(5) from one half of 7 x -1. - Root
Use the law of square roots: cbrt (sqrt[2] (sqrt[4] (6))) = sqrt[n] (6) - Center traverse
Does the middle traverse indeed bisect the triangle? - Diagonals of the rhombus
Calculate the height of the rhombus whose diagonals are 18 cm and 6 cm. - 3-bracket 3
Two angles in a triangle are 90° and 45°. Has the triangle at least two equal sides? - Number
Is number 2.8814789 irrational? - Ratio
Increase the number 25.6 in the ratio 7:4. - Chord
In a circle with a radius r=60 cm is the chord, 4× longer than its distance from the center. What is the length of the chord? - Box
Calculate the angle between box base 5 x 10 and body diagonal length 13. - Rotating cone II
Calculate the area of the surface of a rotating cone with base radius r=15 cm and height h=13 cm. - Is right?
Is a triangle with sides 15, 66, and 68 right triangle? - Proof I
When added to the product of two consecutive integers larger one, we get the square larger one. Is this true or not? - Energy saving
They released three different independent inventions saving 15%, 17%, and 16% energy. Some considered that with the use of these inventions, the total savings would be 15% + 17% + 16% = 48%. Is this true? How much will the percent of energy save all three - Bulbs
In the box are 16 bulbs with power 75 W, 14 bulbs with power 40 W, and 10 with 50 W. Calculate the probability that a randomly selected bulb is: a) 40 W b) 75 W or 40 W - Kitchen
The kitchen roller has a diameter of 78 mm and a width of 315 mm. How many square millimeters roll on one turn?
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