Real numbers - practice for 14 year olds
Number of problems found: 52
- Scientific notation mul
A student found the product of 8 × 10³ and 7 × 105 to be 5.6 × 108. What is the error? What is the correct product? Complete the explanation. - Sum of absolute values
Is it possible for |r| + |s| = |r+s|? If so, when? - Real estate
The residential house has three entrances numbered by odd numbers arithmetic progression. The sum of the two numbers on the corner entrances is 50. Calculate the highest of these three numbers. - Sum and product
The sum of the real numbers x and y is 12. Their difference is 8. What is the value of xy?
- Cube root
Find the cube root of 18 - Angles
Find the interior angles of a rhombus with area 319.1 cm² and perimeter 72 cm. - Estate
Semicircle estate must be a fence. The straight section has a 26 meters long fence. How many meters of the fence should we buy? - Root
Use the law of square roots: cbrt (sqrt[2] (sqrt[4] (6))) = sqrt[n] (6) - Infinitely 3818
We have 2 numbers. If we multiplied the first number's third root by the second number's square root, we would get the number 18. Determine these 2 numbers. Calculate only the integer solution if the problem has infinitely many solutions in the set of rea
- Equation: 3726
Determine the real root of the equation: x^-3: x^-8 = 32 - Discounts on rail (ZSSK)
The railway company ZSSK offers a discount of 15% (REGIONAL) for 5 Eur/year. Calculate the real discount rate as a percentage, where passengers will travel 19 Eur per week. - Wire D
Wire length 1 m is bent to form a semicircle circuit (including the diameter). Determine the radius of the semicircle. - Garden
The square garden area is 2/9 of triangle garden with sides 160 m, 100 m, and 100 m. How many meters of fencing need to fence a square garden? - IS triangle
Calculate interior angles of the isosceles triangle with base 40 cm and legs 22 cm long.
- Diagonals of the rhombus
Calculate the height of the rhombus whose diagonals are 18 cm and 6 cm. - Unknown 63224
On the number line in the middle between the number 428 and the unknown number 290. You will find an unknown number. - Distance of numbers
Which number has the same distance from the numbers -5.65 and 7.25 on the numerical axis? - Sequentially 35731
There are 6 different tickets marked with numbers 1 to 6 in the pocket. In how many different ways can we sequentially, taking into account the order, choose three of them, if the chosen tickets return to the pocket? - Scientific notation
Approximately 7.5x105 gallons of water flow over a waterfall each second. There are 8.6x104 seconds in 1 day. Select the approximate amount of water flowing over the waterfall in 1 day.
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