Question

topic: properties and laws of whole numbers
progress
the movement of the progress bar may be uneven because questions can be worth more or less (including
$1\cdot21\cdot1 = $
23
21
1,211
210

Explanation:

Step1: Multiply first two numbers

$1 \times 21 = 21$

Step2: Multiply result by 1

$21 \times 1 = 21$

Answer:

B. 21