Question

Sam had $0.4$ part of a pizza and gave Jo $0.6$ part of what he had. How much part of the whole pizza does Jo have?

• A. $2.4$
• B. $0.024$
• C. $0.24$

Answer 1

The correct option is C $0.24$

As Jo has $0.6\times 0.4$ part of the whole pizza, we need to compute $0.6\times 0.4$.

Shift the decimal point of $0.6$ by one unit to the right to make it a whole number $6.0$
Similarly, shift the decimal point of $0.4$ by one unit to the right to make it a whole number $4.0$
$\Rightarrow 6\times 4=24$
Now, compensate the shifting of decimal point in $0.4$ and $0.6$ by shifting the decimal point in $24.0$ by two units to the left.
$\Rightarrow 0.6\times 0.4=0.24$
$\therefore$ Jo has 0.24 part of the whole pizza.