Decimal Multiplication and Division
When you multiply decimals, how do you know where the decimal goes in the answer?
Count the number of place values used in the problem.
How do you multiply fractions?
Multiply straight across (numerator x numerator and denominator times denominator)
True or False
You ALWAYS line up the decimals when multiplying.
False
What is always the final step of multiplying fractions?
Simplify!
Increase or Decrease?
1*15/16
Decrease
788.68 divided by 2
394.34
6/12 divided by 3/4 =
2/3
you can not multiply percent's so you must change it to a _______ ?
What is decimal
Simplify 12/18
6/9 or 2/3
Increase or Decrease?
3*5/4
Increase
15.2 x 5.22
79.344
What should we do when we finish multiplying or dividing the fractions?
SIMPLIFY!!!!
5.12 X .003
What is .01536
Change 13/5 into a mixed number.
2 3/5
What type of fraction can you multiply by 1 and it will ALWAYS equal greater than 1?
improper or mixed number
86.52 divided by 4.2
20.6
11/5 x 7/2 =
77/10 or 7 7/10
182.76 divided by 4
What is 45.69
Turn 5 1/4 into an improper fraction
21/4
Increase or Decrease?
3/4*4/5
Decrease
What needs to be changed in order to divide decimals?
The divisor needs to become a whole number
What is the first thing you should do when you are multiplying fractions?
Make all numbers into fractions (regular and improper)
You must do the same thing to the inside of the division sign as the outside when you _______ ?
What is divide decimals
how do you multiply mixed numbers?
change the mixed numbers to improper fractions. (Use MAD)
Increase or Decrease?
1.125*8/3
increase