Cornell Notes 3 FRACTIONS ADDING AND SUBTRACTING FRACTIONS

Cornell Notes #3 FRACTIONS

• ADDING AND SUBTRACTING FRACTIONS WITH EXAMPLE: LIKE DENOMINATORS 2/4 + ¼ = 3/4 • KEEP DENOMINATOR • ADD NUMERATORS ADD 2 + 1=3 EXAMPLE: • ADDING AND UNLIKE DENOMINATORS SUBTRACTING ½ + 1/6 = FRACTIONS WITH UNLIKE DENOMINATORS • FIND THE LCD (LEAST LIKE DENOMINATORS (NUMBER ON THE BOTTOM) COMMON DENOMINATOR) • 6 IS THE LCD • MULTIPLY ½ x 3/3=3/6 • ADD 3/6 + 1/6=4/6

• MULTIPLYING FRACTIONS • DENOMINATORS • SAME OR DIFFERENT EXAMPLE: JUST MULTIPLY STRAIGHT ACROSS ½ x 3/5 = NUMERATORS 1 x 3=3 DENOMINATOR 2 x 5=10 SO… 1/2 x 3/5=3/10 • DIVIDING FRACTIONS EXAMPLE: • LEAVE 1 ST FRACTION • CHANGE SIGN TO X • FLIP SECOND FRACTION 1/7 ÷ 3/5 = LEAVE 1 ST FRACTION 1/7 X CHANGE TO X (MULTIPLICATION) 1/7 X 5/3 FLIP SECOND FRACTION 1/7 x 5/3= 5/21

Guided Practice: • • 2/7 + 3/7= Adding Fraction with like denominators Add numerators 2 + 3=5 Denominators remain the same 7 2/7 + 3/7=5/7 2/7 + 1/14= • Adding Fraction with unlike denominators • Find LCD… 14 • Multiply 2/7 X 2/2=4/14 • 4/14 + 1/14=5/14

Guided Practice • 1/3 X ¼= • Do we need to find a common denominator? • No. Just multiply straight across • 1 x 1=1 numerator • 3 x 4=12 denominator…. so the answer is 1/12 • 1/3 ÷ 4= • Stay, change, flip • 1/3 x ¼= because 4= 4/1 so flip is ¼ • Multiply straight across • =1/12

Individual Practice 1. ½ + ¾= 2. 2/3 + 4/9= 3. ¾ X ½= 4. ¾ ÷ 2= 5. 1/5 x ¼= 6. 1/5 ÷ 4=