ප්රශ්න 44ම, එක් එක් ප්රශ්නය පරීක්ෂා කරන දේ සමඟ. ඕනෑම එකක් ගෙදර සර් තුළ නොමිලේ උත්සාහ කර ඔබේ පිළිතුර පරීක්ෂා කරන්න.
First approximation of a square root using given squares

3.5
💡 ප්රශ්නයේ අදහස: වර්ගමූලයක පළමු සන්නිකර්ෂණය යනු දශමස්ථාන එකක් සහිත ආසන්නතම අගයයි. දී ඇති වර්ග අතරින් 12 වඩා ළඟ කුමකටදැයි බලන්න.
- 12 ට දෙපසින් ඇති වර්ග දෙක බලන්න: 3.4² = 11.56, 3.5² = 12.25.
- 12 සිට එක් එක් වර්ගයට දුර සොයන්න: 12 − 11.56 = 0.44, 12.25 − 12 = 0.25.
- 0.25 කුඩා නිසා 12 වඩා ළඟ 3.5² ටයි.
- එබැවින් √12 හි පළමු සන්නිකර්ෂණය 3.5 වේ.
✅ 3.5 × 3.5 = 12.25 යි; එය 12 ට ඉතා ළඟ නිසා 3.5 සාධාරණයි.
Working in English
A first approximation of a square root means the closest value with one decimal place. Use the squares given and see which one 12 is nearer to.
- Look at the two squares on either side of 12: 3.4² = 11.56 and 3.5² = 12.25.
- Find how far 12 is from each: 12 − 11.56 = 0.44 and 12.25 − 12 = 0.25.
- 0.25 is smaller, so 12 is closer to 3.5².
- So the first approximation of √12 is 3.5.
Expand the product of two binomials

x² − 3x − 10
💡 ප්රශ්නයේ අදහස: වරහන් දෙකක් ප්රසාරණය කිරීමේදී පළමු වරහනේ සෑම පදයක්ම දෙවන වරහනේ සෑම පදයකින්ම ගුණ කළ යුතුය. ඉන්පසු සමජාතීය පද එකතු කරන්න.
- මුල් පද ගුණ කරන්න: x × x = x².
- පිට හා ඇතුළු පද යුගල ගුණ කරන්න: x × 2 = 2x, −5 × x = −5x.
- අවසාන පද ගුණ කරන්න: −5 × 2 = −10.
- x පද එකතු කරන්න: 2x − 5x = −3x. එවිට x² − 3x − 10 ලැබේ.
✅ x = 1 ආදේශ කරන්න: (1 − 5)(1 + 2) = −12, 1 − 3 − 10 = −12. දෙකම සමානයි.
Working in English
To expand two brackets, every term in the first bracket must multiply every term in the second. Then add the like terms together.
- Multiply the first terms: x × x = x².
- Multiply the outer and inner pairs: x × 2 = 2x and −5 × x = −5x.
- Multiply the last terms: −5 × 2 = −10.
- Add the x terms: 2x − 5x = −3x, giving x² − 3x − 10.
List the complement of a set from a Venn diagram
සරල රේඛා, සමාන්තර රේඛා ආශ්රිත කෝණAngles formed by parallel lines and a transversal

Missing value from a given mode

Profit percentage from cost and selling price
සරල රේඛා, සමාන්තර රේඛා ආශ්රිත කෝණAngles on a straight line with a right angle

Radius of a quarter circle from its arc length

Simplify a quotient of powers with positive indices

Factorise a trinomial quadratic expression

Side of a parallelogram by equating two area calculations
වීජීය ප්රකාශනවල කුඩාම පොදු ගුණාකාරයLCM of three algebraic terms

Base angle of an isosceles triangle

Height of a triangle from its area, inside a trapezium

Interior angle using the exterior angle theorem

Subtract algebraic fractions with a common denominator

State the congruence condition for two triangles

Days needed when the number of workers changes

Area of a trapezium from sum of parallel sides and height

Angle using corresponding parts of congruent triangles

Solve a linear equation with brackets

Locate a point on a perpendicular bisector at a fixed distance

Probability of one category from a two-way table
සරල රේඛා, සමාන්තර රේඛා ආශ්රිත කෝණAngles in a trapezium using parallel lines

Gradient and intercept of a linear function

Successive fractions of a bottle of water; find capacity

Arc length, Pythagoras diagonal and perimeter of a logo
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Area of a shaded composite region with a sector
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Pie chart: sector angles, totals, and a redrawn chart angle

Inverse proportion with water supply and changing number of students

Venn diagram entry, shading, set notation and subsets

Loan interest, marked price discounts and profit comparison

Table and graph of a linear function; intersection with y = x

Area expression with a squared binomial; solve for x

Solve a pair of simultaneous equations
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Factorise a trinomial and a difference of two squares
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Mode, range and mean from a frequency table; projection

Scale diagram from bearings and distances; read bearing and distance

Number patterns from general terms; term values and differences

Cuboid tank volumes, water level and displaced volume

Construct a perpendicular bisector, a triangle, angle bisector and circle
සමාන්තරාස්ර I · අංගසාම්යයParallelogram perpendiculars: congruent triangles and equal lengths

Isosceles triangle proofs: exterior angle, isosceles, equilateral

Sets from card numbers and simple probabilities
