Algebraic Expressions and Identities — Maths STD 8 — Question
Maharashtra BoardEnglish MediumSTD 8MathsAlgebraic Expressions and Identities3 Marks
Question
$1.8 \times 2.2$
✓
Answer
Here, we will use the identity $(a-b)(a+b)=a^2-b^2$
Let us consider the following expression:
$1.8 \times 2.2$
$\because \frac{1.8+2.2}{2}=\frac{4}{2}=2$, therefore, we will write the above product as:
$1.8 \times 2.2$
$=(2-0.2)(2+0.2)$
$=(2)^2-(0.2)^2$
$=4-0.04$
$=3.96$
Thus, the answer is 3.96
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.