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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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decimal review
Decimal Review

244.4 ÷ 2.6

9.8 X 1.73

slide2

Adding Fractions

  • Steps:
  • Find common denominator (if needed).
  • 2. Add Numerators.
  • Keep denominator!
  • Simplify ALWAYS!
slide3

Adding Mixed #’s

  • Steps:
  • Change to common denominator (if needed).
  • 2. Add whole numbers & numerators!
  • Keep Denominator
  • ALWAYS Simplify!
slide4

Subtracting Fractions

  • Steps:
  • Find common denominator (if needed).
  • 2. Subtract Numerators.
  • Keep denominator!
  • ALWAYS Simplify!
slide5

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!
slide6

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!!
slide7

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:

slide8

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)
slide9

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!
slide10

**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 =

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