Question

d. area: $4 \times 9 = 4 \times (3 \times 3)$
$= 4 \times 3 \times 3$
$= \underline{\quad\quad} \times \underline{\quad\quad}$
$= \underline{\quad\quad}$
area: $\underline{\quad\quad}$ sq cm

Explanation:

Step1: Rearrange multiplication order

$\boldsymbol{(4 \times 3) \times 3}$

Step2: Calculate first product

$12 \times 3$

Step3: Compute final product

$36$

Step4: Identify side lengths

The rectangle has sides $\boldsymbol{4\ \text{cm}}$ and $\boldsymbol{9\ \text{cm}}$ (from $4 \times 9$)

Answer:

Side lengths: 4 cm, 9 cm
Filled calculation steps:
$= 12 \times 3$
$= 36$
Area: 36 sq cm