Visualising Factors of Composite Numbers

Q. Using identities, evaluate:
$1.02\times 9.8$

1. $0.09975$
2. $9.996$
3. $99.96$
4. $0.9976$

Q.

Using identities, evaluate:
$1.05\times 9.5$

1. $0.09975$
2. $99.75$
3. $0.9975$
4. $9.975$

Q.

Find the value of:

$\frac{(383.08{)}^2-({303.08}^2)}{686.16}$

1. 8

2. 383.08

3. 80

4. 800