Multiplication or Division?
The words "separated equally"...multiplication or division?
Division
Solve the problem:
I have 2 groups of 5 dogs. The dogs took a walk together. How many dogs are there altogether?
2x5 = 10 dogs
How do I know that I have to divide in this problem:
There are 12 dogs in the park. They are split between 4 people. How many dogs does each person get?
I know it is division, because of the words split between.
Think of one subtraction clue word and think of one division clue word.
Subtract, take away, less than, etc.
Divide, separated, split up, etc.
The words "split up" and "broken into"....multiplication or division?
Division
Solve the problem:
There are 10 jars of m-n-ms. We put 20 m-n-ms in each jar. How many m-n-ms are there altogether?
10x20 = 200 m-n-ms
In this problem, are we looking for the number of groups or the number of objects:
I have 36 socks. They will be broken into pairs of 2 socks. How many pairs of socks will I have?
Looking for the number of groups.
Think of 3 clue words that could mean multiplication and addition.
In all, total, and altogether
I have 10 piles of 6 rocks and need to combine them into one group. Will I multiply or divide?
Multiply
Solve the problem:
There are 7 boxes of erasers. We put 6 erasers in each box. How many erasers are there altogether?
7x6 = 42 erasers
In this problem, are we looking for the number of groups or the number of objects:
The cup had 50 chocolate chips in it. The chocolate chips were split between 5 bags. How many chocolate chips would be in each bag?
The number of objects.
How are division and subtraction similar?
When we divide or subtract, our answers get smaller.
I have a pile of 100 rocks and need to break them into groups of 5. Will I multiply or divide?
Divide
There were 4 classrooms and each classroom had 6 students in it. How many students are there total?
4x6 = 24 students
Solve the problem:
I have 36 socks. They will be broken into pairs of 2 socks. How many pairs of socks will I have?
36 socks/ 2 socks = 18 pairs of socks
How are multiplication and addition similar?
When we add or multiply, the group of objects gets bigger.
Explain how you would solve this problem:
I had a bag of 50 cookies. I needed to break them into groups of 10 cookies. How many groups do I need?
Circle the numbers.
Underline the label.
Highlight the clue words.
Solve the problem.
You would divide, because of the clue words "break into groups."
There are 7 bags of cookies. We put 4 cookies in each bag. How many cookies are there total?
7x4 = 28 cookies
Solve the problem:
The cup had 50 chocolate chips in it. The chocolate chips were split between 5 bags. How many chocolate chips would be in each bag?
50 chocolate chips/5 bags = 10 chocolate chips.
How are addition and subtraction different from each other?
When we add, we are making the group bigger. When we subtract, we are making the group smaller.