← Back to course
Kitchen 3-5 / Week 10 / Tuesday
2/6
Week 10 · Cook for a Crowd

Tuesday

Scale it down
// Scale it up, scale it down
⏱ about 15 min

Tuesday: Scale It Down

Bennie the Bear wants to try the soup at lunch, just for two.

"Four bowls is too many," he says. "I need half a batch."

Ferris points at the 1/2 cup of pasta. "What do you notice? What is half of a half?"

Riley draws a square and splits it. "Here is a hint," he says. "Split it, then split it again."

A fraction times a fraction

Half a batch means multiply every amount by 1/2.

1/2 times 1/2 cup is half of a half cup. That is 1/4 cup.

To multiply fractions, multiply the tops. Then multiply the bottoms.

1/2 times 3/4 is 1 times 3 over 2 times 4. That is 3/8.

Amount for 4 bowlsTimes 1/2 (2 bowls)
1/2 cup of pasta1/4 cup
1/4 teaspoon of salt1/8 teaspoon
4 cups of broth2 cups
1 cup of green beans?
1/2 times 1 cup of green beans is 1/____ cup.
1/2 times 1/4 is 1/____.
1/2 times 2/3 is 2/____.
On paper, draw a square for 1 cup. Shade 1/2. Then shade half of that part. Label it 1/4.
HALF BATCH CHECK
  • Read the question.
  • Tap your answer.
What is 1/2 times 1/2?
What is 1/2 times 3/4?
A half batch of 4 cups of broth is how many cups?
StatementTrue or false?
Multiplying by 1/2 makes an amount smaller.?
1/2 times 1/2 is 1.?
Half of 1/4 teaspoon is 1/8 teaspoon.?
WHY THIS EXERCISEA fraction less than 1 shrinks the amount.
What is 1/3 times 1/2? Type the fraction, like 1/5.
WHY THIS EXERCISEOne third of one half is one sixth.
Safety first
On cook day, a grown-up handles the stove for any size batch.
Today you only do the math.

Fraction pro! Tomorrow is Kitchen Lab. You will count spoons into cups.

← Monday