Do Now

Do NowSolve. Write in simplest form.

10/8/2014 2-3 B Divide Whole #’s by Fractions

Reciprocal- one of two numbers with a product of 1-in real terms- flip the numerator and denominator

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Student Example

Example 1

Example 2Find the reciprocal of 7.

Method:

• To divide a whole number by a fraction, multiply its reciprocal.

KCFEEP

HANGE

LIP

• Step 1 – Keep your first fraction.

÷4

31

1 = 31

Example 3

• Step 2 – Change the operation to multiplication.

÷4

31

1 = 31 x

• Step 3 – Flip the second fraction.

÷4

31

1 = 31 x 1

4

• Step 4 – Multiply the numerators, then multiply the denominators.

x 131

4 = 121

• Step 5 – Simplify (if possible).

x 131

4 = 121 =12

Example 4

Multiply numerators. Multiply denominators.

Example 5

Multiply by the reciprocal.

2

1

Divide 4 and 2 by the GCF, 2.

Simplify.

Answer: So, there are 6 runners in the race.

Your Turn!

Homework

• Pg. 122 #1-28 Evens• Ch. 1 Test Corrections due tomorrow!