Math 9 ­ 1.4 ­ Multiplying and Dividing Rational Numbers.notebook
1.4 - Multiplying and Dividing
Rational Numbers
1. Rules for multiplying and dividing
decimals
(This is the same rule you learnt in grade 8 with multiplying and dividing integers)
(+) X (+) = _____
(+) X (-) = _____
(-) X (+) = _____
(-) X (-) = _____
Math 9 ­ 1.4 ­ Multiplying and Dividing Rational Numbers.notebook
Ex 1) Complete the following operations:
a) 4.2 X 3.4
c) -3.5 X 4
b) 7.3 X (-0.8)
d) -2.1 X (-6.3)
2. Rules for multiplying fractions
(This is the same rule you learnt in grade 8)
Step 1: Convert mixed numbers to improper fractions
Step 2: Multiply the numerator by the numerator
Step 3: Multiply the denominator by the denominator
Step 4: Reduce to lowest terms
Note: The word "OF" means to multiply.
Math 9 ­ 1.4 ­ Multiplying and Dividing Rational Numbers.notebook
Ex 2) Complete the following operations:
a)
b)
Math 9 ­ 1.4 ­ Multiplying and Dividing Rational Numbers.notebook
3. Rules for dividing fractions
(This is the same rule you learnt in grade 8)
Step 1: Convert mixed numbers to improper fractions
Step 2: Find the reciprocal of the SECOND fraction (switch the
numerator and the denominator)
Step 3: Multiply the numerator by the numerator
Step 4: Multiply the denominator by the denominator
Step 5: Reduce to lowest terms
Ex 3) Complete the following operations:
a)
Math 9 ­ 1.4 ­ Multiplying and Dividing Rational Numbers.notebook
b)