To find the number that, when subtracted from -2.24, equals 4.24, you can set up the equation:
\[ -2.24 - x = 4.24 \]
To solve for \( x \), first, isolate \( x \) by adding \( 2.24 \) to both sides:
\[ -x = 4.24 + 2.24 \]
This simplifies to:
\[ -x = 6.48 \]
Now, multiply both sides by -1:
\[ x = -6.48 \]
So, the answer is:
\(-2.24\) minus \(-6.48\) equals \(4.24\).