Price of several books from the price of one
Rs 210
💡 What it's asking: Every book costs the same, so the total is just the price of one book repeated 5 times.
- Write the price of one book: Rs 42.
- Multiply by the number of books: 42 × 5.
- Break it up: 40 × 5 = 200 and 2 × 5 = 10.
- Add: 200 + 10 = Rs 210.
✅ 5 books at about Rs 40 each is about Rs 200, so Rs 210 is sensible.
සිංහලෙන් විසඳුම
සෑම පොතක්ම එකම මිල නිසා මුළු මිල යනු එක් පොතක මිල 5 වතාවක් ගැනීමයි.
- එක් පොතක මිල ලියන්න: රු. 42.
- පොත් ගණනින් ගුණ කරන්න: 42 × 5.
- කොටස් කරන්න: 40 × 5 = 200, 2 × 5 = 10.
- එකතු කරන්න: 200 + 10 = රු. 210.
Convert kilometres to metres
3200 m
💡 What it's asking: A kilometre is a long distance made of 1000 metres, so we multiply by 1000.
- Remember: 1 km = 1000 m.
- Multiply: 3.2 × 1000.
- Multiplying by 1000 moves the decimal point 3 places to the right: 3.2 → 3200.
- Answer: 3200 m.
✅ Metres are smaller than kilometres, so the number must get bigger; 3200 is bigger than 3.2.
සිංහලෙන් විසඳුම
කිලෝමීටරයක් යනු මීටර 1000 ක දුරකි, එබැවින් 1000 න් ගුණ කරමු.
- මතක තබා ගන්න: 1 km = 1000 m.
- ගුණ කරන්න: 3.2 × 1000.
- 1000 න් ගුණ කරන විට දශම තිත ස්ථාන 3 ක් දකුණට යයි: 3.2 → 3200.
- පිළිතුර: මීටර 3200.
Subtract two fractions with the same denominator
Angles Related to Straight Lines and Parallel LinesEqual angles on a straight line with a right angle
Solve a one-step linear equation
Probability of drawing a black ball
Shade A intersect complement of B on a Venn diagram
Change the subject of a simple-interest amount formula
Value of a reciprocal of a negative power
Add two base-two numbers
Men needed to finish a wall in fewer days
Total frequency from a histogram with unequal class widths
Shaded area between a square and its inscribed circle
Base angle of an isosceles triangle from an exterior angle
Draw a straight line with negative gradient
Area of Plane Figures between Parallel LinesParallelogram area from a triangle on the same base
Cone height equal in volume to a sphere
Second-year compound interest on a deposit
Unknowns from a column-matrix equation
Time to fill a tank at a uniform rate
Range and median of seven values
Exterior angle of a cyclic quadrilateral
Factors of Algebraic ExpressionsFactorise a difference of two squares
Opposite side from a tangent ratio
Sketch loci for points a fixed distance from two points
Angle in a semicircle and angles on the same arc
Algebraic Fractions · EquationsSolve an equation with algebraic fractions
Segment of hypotenuse using equiangular right triangles
Sum of squares from sum and product
Tangents · Pythagoras' TheoremPerimeter of kite formed by two tangents and radii
