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Fundamental Concepts (Including Fundamental Operations) — MATHS STD 7 — Question

ICSE BoardEnglish MediumSTD 7MATHSFundamental Concepts (Including Fundamental Operations)2 Marks
Question
Simplify: $\frac{4 a}{7}+\frac{2 a}{3}-\frac{a}{7}$
✓

Answer


$\begin{aligned} & \frac{4 \mathrm{a}}{7}+\frac{2 \mathrm{a}}{3}-\frac{\mathrm{a}}{7} \\ & =\frac{12 \mathrm{a}-14 \mathrm{a}+3 \mathrm{a}}{21} \\ & =\frac{15 \mathrm{a}-14 \mathrm{a}}{21} \\ & =\frac{\mathrm{a}}{21} \ldots(\text { LCM of } 7,3=21)\end{aligned}$

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