Answer
(a) 4/10
(b) 6/10
Work Step by Step
When writing a fraction, the total always goes in the denominator, while the fraction of that total always goes in the numerator. 4 pieces have been removed out of 10 total, so the total removed is:
$$ \frac{4}{10}$$
(b) 6 pieces remain out of 10, so:
$$ \frac{6}{10}$$
