O/L past papers › 2019
අ.පො.ස. (සා/පෙළ) ගණිතය 2019 ප්රශ්න පත්රය සහ පිළිතුරු
The G.C.E. O/L Mathematics 2019 paper (held December 2019): all 42 questions from Paper I and Paper II, with what each question tests. Try any question free in Gedara Sir to check your answer and see step-by-step working in English and Sinhala.
Customs duty as a percentage of an item's value
Answer: Rs 540
💡 What it's asking: The duty is just 9% of the value.
✅ 10% would be 600, so 9% should be a little less: 540 fits.
බද්ද යනු වටිනාකමෙන් 9% පමණි.
Factorise a monic trinomial
Answer: (x + 5)(x - 2)
💡 What it's asking: We need two numbers that multiply to −10 and add to 3; they go into the brackets.
✅ Expand: x² − 2x + 5x − 10 = x² + 3x − 10. Correct.
ගුණිතය −10 ද එකතුව 3 ද වන සංඛ්යා දෙකක් අවශ්යයි; ඒවා වරහන්වලට යයි.
Base angle of an isosceles triangle from the apex angle
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