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# Decimal Review - PowerPoint PPT Presentation

Decimal Review. 244.4 ÷ 2.6. 9.8 X 1.73. Adding Fractions. Steps: Find common denominator (if needed). 2. Add Numerators . Keep denominator! Simplify ALWAYS !. Adding Mixed #’s. Steps: Change to common denominator (if needed). 2. Add whole numbers & numerators!

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244.4 ÷ 2.6

9.8 X 1.73

• Steps:

• Find common denominator (if needed).

• 2. Add Numerators.

• Keep denominator!

• Simplify ALWAYS!

• Steps:

• Change to common denominator (if needed).

• 2. Add whole numbers & numerators!

• Keep Denominator

• ALWAYS Simplify!

Subtracting Fractions

• Steps:

• Find common denominator (if needed).

• 2. Subtract Numerators.

• Keep denominator!

• ALWAYS Simplify!

Subtracting Mixed #’s

• Steps:

• Change to common denominator (if needed).

• 2. If you need to borrow with subtraction: BORROW from whole #, ADD bottom to top!

• Subtract whole numbers & numerators!

• Keep Denominator

• ALWAYS Simplify!

Multiplying Fractions

DO NOT FIND

COMMON DENOMINATORS!

• Steps:

• 1. Rewrite in fraction form – Turn mixed #’s & whole #’s into improper fractions!

• 2. Cross Simplify…if you can!

• 3. Multiply STRAIGHT Across! Top times top, bottom time bottom

• 4. Simplify…as always!!

NOTES: Multiply Fractions with Models

Steps:

1. Think of a fraction model for each factor.

2. Overlap those models, and that’s it! 

3. The boxes that have both patterns represent the product.

Example:

Dividing Fractions

DO NOT Have to FIND

COMMON DENOMINATORS!

• Rewrite in fraction form

• Turn mixed #’s & whole #’s into improper fractions!

• 2. Keep, Change, Flip

• Keep the first fraction

• Change ÷ to x

• Flip the second fraction (reciprocal)

NOTES: Divide Fractions with Models

means how many ’s are in ?

So, I have 4 groups of 2!

Let’s try a fraction:

• means how many ’s are in ?

• So, I have 8 groups of ½!

**If you want to find common denominators, you can. Your denominators will divide away, and you will divide the numerators straight across.

Once you have a common denominator, divide straight across.

3 ÷ 2 =