Hello!
Let's convert 2/3 to a decimal and then divide 12 balls of yarn by that.
To convert a fraction to a decimal, we must divide its numerator by its denominator.
2 ÷ 3 = 0.67 (6 Repeating)
Now, divide 12 yarn balls by this:
12 ÷ 0.67 (Repeating) = 17.91 (Repeating decimal)
A N S W E R:
Christopher can make 18 scarves with 12 balls of yarn.