Part-Part-Whole
Fact Families
Missing parts
The equal sign
100
Define what a part is.
Numbers you add together to make a whole.
100
What is a fact family?
a group of numbers you put together to make a number sentence.
100
What is your missing part?
3+__=7
4
100
8=9
Is this equal?
no
200
Define what the whole is.
The sum of an addition sentence, the first number in a subtraction sentence, the biggest number.
200
Name an addition sentence you can use with these numbers.
3+2=5 or 2+3=5
200
What is your missing part?
4+__=9
5
200
4=4
Are these equal?
yes
300
The numbers are 3,7, and 4. Which one is the whole?
7
300
Name a subtraction sentence you can use with this fact family.
5-3=2 or 5-2=3
300
8-__=2
6
300
What does equals mean?
Equals is the same as.
400
Which numbers are your parts?
10 and 8
400
Name 2 addition sentences you can use with this fact family.
10+8=18 and 8+10=18
400
6-__=0
6
400
9+1=5+5
Is this equal? Why?
Yes, both sides equal 10
500
Make a part-part-whole chart on the board. Fill in with numbers.
?
500
Name 2 subtraction sentences you can use with this fact family.
18-10=8 and 18-8=10
500
8-__=2+__
3, so both sides equal 5
500
Why do we have an equal sign?
To show the answer AND to show how both sides of the equal sign need to equal the same number.