Thursday, January 11, 2007
Wednesday, January 10, 2007
notes 7.3
7.3 Multiplying Fractions
Denominators DO NOT have to match.
1) Change any mixed numbers into improper fractions
2) Multiply the numerators, get a number
3) Multiply the denominators, get a number
4) Reduce your new fraction
5) Done!
Denominators DO NOT have to match.
1) Change any mixed numbers into improper fractions
2) Multiply the numerators, get a number
3) Multiply the denominators, get a number
4) Reduce your new fraction
5) Done!
Monday, January 08, 2007
notes 7-2
7.2 Adding and Subtracting Unlike Fractions
To find the sum or difference of 2 fractions with DIFFERENT denominators:
1) Find the LCD of the two fractions
a) find the LCM of the 2 denominators
½ + 2/3 LCM of 2 and 3 is 6
b) multiply the top and bottom of the fraction by the same number so your denominator is now what you want it to be
1(3)/2(3) = 3/6 2(2)/3(2)= 4/6
c) your denominators should now match
d) add or subtract as usual
3/6 + 4/6 = 7/6
e) reduce
1 1/6
try:
2/6 + 9/12 ¾ + ½ 9/10 + 1/50 3 7/8 + 5 1/3
try with +’s and –‘s
pg 283 # 15-33
puzzles ws’s
ws 7-2
To find the sum or difference of 2 fractions with DIFFERENT denominators:
1) Find the LCD of the two fractions
a) find the LCM of the 2 denominators
½ + 2/3 LCM of 2 and 3 is 6
b) multiply the top and bottom of the fraction by the same number so your denominator is now what you want it to be
1(3)/2(3) = 3/6 2(2)/3(2)= 4/6
c) your denominators should now match
d) add or subtract as usual
3/6 + 4/6 = 7/6
e) reduce
1 1/6
try:
2/6 + 9/12 ¾ + ½ 9/10 + 1/50 3 7/8 + 5 1/3
try with +’s and –‘s
pg 283 # 15-33
puzzles ws’s
ws 7-2
Thursday, January 04, 2007
notes 7-1
7.1 Adding and Subtracting Like Fractions
Take half a pie and add another half a pie you get-----one whole pie
½ + ½ = 2/2= 1
To add 2 fractions with the same denominator:
1) add the numerators
2) keep the same denominator
¼ + 2/4 3/7 + 2/7 14/25 + 4/25 12/5+ 3/5
To subtract 2 fractions with the same denominator:
1) subtract the numerators
2) keep the same denominator
4/7-2/7 9/10 – 8/10 25/100 – 10/100 5/4-6/4
*Always reduce answers!!!!!!!!!!!!!!!
guided prac pg 280
pg 280 # 9-25
ws 7-1
Take half a pie and add another half a pie you get-----one whole pie
½ + ½ = 2/2= 1
To add 2 fractions with the same denominator:
1) add the numerators
2) keep the same denominator
¼ + 2/4 3/7 + 2/7 14/25 + 4/25 12/5+ 3/5
To subtract 2 fractions with the same denominator:
1) subtract the numerators
2) keep the same denominator
4/7-2/7 9/10 – 8/10 25/100 – 10/100 5/4-6/4
*Always reduce answers!!!!!!!!!!!!!!!
guided prac pg 280
pg 280 # 9-25
ws 7-1
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