Oh, now you’re thinking ahead. If half of 2 1/2 is 1 1/4, then double that is back to 2 1/2 cups. It’s a circle. A delicious, floury circle. You’re basically a mathematician now. Congratulations.
But seriously, if you’re scaling up, always multiply your fractions. Don’t double your half. That’s how you end up with a cake that overflows. And nobody wants a floor-cake.
The Secret Weapon: A Simple Fraction Reminder
Here’s a trick I use: half of anything with a fraction is just halving the whole number and then halving the fraction. For 2 1/2: half of 2 is 1. Half of 1/2 is 1/4. Add ‘em. Done.
What Is Half Of 2/3 Cup Liquid at George Vaughan blog
You can apply this to life, too. Half of 3 1/3 cups? Half of 3 is 1.5. Half of 1/3 is 1/6. Good luck measuring that. But for 2 1/2? You’re golden.