Fraction Rules
I need a common denominator when __________ and ____________ fractions
adding and subtracting
2/3 * 4/5
8/15
What is the reciprocal of
11/8
8/11
Sophia baked a tray of cookies. She gave 2/3 of the tray to her classmates.
Later, they ate 3/4 of the baked cookies.
Question:
What fraction of the whole tray of cookies did her classmates eat?
1️⃣ Multiply the fractions: 2/3 × 3/4 = 6/12
2️⃣ Simplify: 6/12 = 1/2
Answer:
Sophia’s classmates ate 1/2 of the whole tray of cookies. 🍪
How do we change a whole number into a fraction?
Put a 1 in the denominator, or put it over 1.
3/5 * 7/8
21/40
3/8 -: 2/3
9/16
What is 8x8?
64
3 word phrase to help us with dividing fractions.
Copy - Dot - Flip
4 * 7/8
7/2 or 3 1/2
6 -: 5/8
48/5 or 9 3/5
Simplify: 6/12
1/2
For a fraction to be considered "improper," what must be true about its numerator and denominator?
The numerator must be greater than or equal to the denominator.
5/12 * 9
15/4 or 3 3/4
1/2 -: 6
1/12
1/2 × 3/4=
3/8
True or False: You need to find a common denominator before multiplying fractions.
False
2/3 * 1/4
2/12 = 1/6
3/8 -: 7/12
9/14
14/28
1/2