Question

one group less
10 × 30 = 300
9 × 30 = ?

Explanation:

Step1: Relate to given equation

We know $10 \times 30 = 300$.

Step2: Subtract one group of 30

$9 \times 30 = 300 - 30$

Step3: Calculate the result

$300 - 30 = 270$

Answer:

$9 \times 30 = 270$