Notes 7.2B Decimal Operations

*Line the decimals up! EX: 2.345 + 13.41 Answer: 15.755 Adding Decimals *Line the decimals up! EX: 2.345 + 13.41 Answer: 15.755 Rewrite:

*Line up the decimals! EX: 11.428 + 8.67 Answer: 2.758 Subtracting Decimals *Line up the decimals! EX: 11.428 + 8.67 Answer: 2.758 Rewrite:

Multiplying Decimals Rewrite: *Put the number with most digits on top and line up LAST numbers Move the decimal back at the end EX: 2.345 x 13.4 Answer: 31.423 Rewrite:

Dividing Decimals Rewrite: *Kick the ball to the wall Do the same in the hall & Throw it on the roof EX: 25.7 ÷ 3.1 Answer: 8.290 Rewrite:

7.2B Fraction Operations

*we must first find a COMMON DENOMINATOR Adding Fractions *we must first find a COMMON DENOMINATOR Then add the numerators EX: 2 ¾ + 5 ½ Rewrite (w/ common denominators):

Subtracting Fractions *we must first find a COMMON DENOMINATOR Then subtract the numerators EX: 4 1/3 - 3 ½ Rewrite (w/ common denominators):

Multiplying Fractions Multiply numerator times numerator to get our numerator And multiply denominator times denominator to get our denominator

Mixed Numbers: Need to make an improper fraction then multiply 1 3 2 3 2 X 1 3 8 3 8 9 = X Improper Fraction – bigger numerator than denominator

= = Dividing Fractions 1 3 2 5 1 3 5 2 ÷ X 5 6 If dividing fractions Keep the first fraction Flip the second (reciprocal) and Change the sign (KFC) 1 3 2 5 1 3 5 2 = ÷ X reciprocal = 5 6

Dividing Mixed Numbers: 1 4 1 3 2 ÷ = 1 4 7 3 = ÷ 1 4 3 7 3 28 = X

Practice Questions On your own sheet of notebook paper please complete the following problems: p 293 #20-28 (odds) p 304 #39-47(odds) p 316 #15-19(odds), 21-25(odds)

Book Practice On a separate sheet of paper please do the following questions in your book: (and please show your work) Page 137 #25-30 Page 150 #26-30 Page 713 #16-20