Multiplying Decimals
10 x 2.1
21
100 divide 0.5
200
True or false: When multiplying fractions you need a like denominator.
False
True or false: When dividing fractions you need a like denominator.
False
What is the number on the bottom of a fraction called?
denominator
What is the first step to multiply decimals?
Write the problem down without the decimal points.
What is the first step you need to do when you are doing decimal division?
Move the decimal point in the divisor to make it a whole number. Move it the same number of places in the dividend.
Chandra solved the problem below. She got 10/12. What did she do wrong?
2/4 * 3/5
She multiplied the numerators by the denominators.
What are the steps to solve a fraction division problem?
Write the problem, turn the whole number into a fraction, swap the numerator and denominator of the divisor, change the division to multiplication, solve the problem like a multiplication problem.
What is the answer to a multiplication problem called?
Product
$3.99 x 4.6
18.354
What is the most important step for dividing decimals that you do not need to do when dividing whole numbers?
Line up the decimal point from the dividend to the quotient
Name 2 common mistakes people could make when multiplying fractions
swapping numerator and denominator, messing up multiplication, drawing the model wrong, etc...
3/5 divide 6/8
24/30
12/15
4/5
Quotient
(2.1 x 0.2) + (5.1 x 1.2)
6.54
3.168 divide 1.32
2.4
Solve and simplify
3/8 * 4/16
3/32
1 3/4 divide 2
7/8
What word in a word problem indicates that the problem will be multiplication?
"of"
Sarah's mom sends her to the store. She has to buy 3 bananas ($1.46 each), 2 gallons of milk ($7.99 each), and 12 pieces of candy ($.69 each). How much will all of this cost?
$28.64
Marshall has a plank that is 7.02 feet long. He needs to cut it into pieces that are 1.3 feet long. How many pieces can he cut?
5.4 (5 pieces)
Maria has 1 1/2 containers of paint. Each container holds 3/8 gallons of paint. How many gallons does Maria have?
9/16
Janine has 5 apples. Cuts them into 1/4's. How many pieces of apple does she have.
20
In the following word problem, what kind of math do you need to do to solve it? DeShawn has 3.5 bottles of water. Each full bottle holds 8.25 fluid ounces.
DeShawn wants to know how many fluid ounces of water he has in all.
Multiplication