Fact Families
What is a fact family of 6+4=10?
4+6=10
10-4=6
10-6=4
I know 2+2=4. So, what is 2+3?
5.
I know 2+2=4. So, 2+2+1=5.
Use a ten frame to solve.
8+9=
17.
We move 1 counter to make a 10. We have 7 left on a ten frame. So, 10+7=17.
Use a number line to count on.
5-3=
2.
Starting at 3, we jump 2 spots to get to 5.
True or false
We can flip our addends to add in any order.
True.
4+3 is the same as 3+4. We end up with the same sum.
What is a fact family of 2+4=6
4+2=6
6-2=4
6-4=2
I know 4+4=8. So, what is 4+5?
9.
I know 4+4=8, so 4+4+1=9.
Use a ten frame to solve.
9+7=
16.
We move 1 counter to the ten frame to make 10. We have 6 left over in a ten frame. So, 10+6=16.
Use a number line to count on.
8-2=
6.
Starting at 2, we jump 6 spots to get to 8.
Can we flip the addends in an equation?
Example:
5+6=
6+5=
Yes. We can switch our addends to add in any order.
5+6 is the same as 6+5.
Make a number bond for 8+4=12
12 is the sum or whole.
8 and 4 are the parts.
I know 6+6=12. So, what is 6+7?
13.
I know 6+6=12. So, 6+6+1=13.
Use a ten frame to solve.
7+6=
13.
We move 3 counters to the ten frame to make 10. We have 3 counters left over in a frame. So, 10+3=13.
Use a number line to count on.
9-4=
5.
Starting at 4, we move 5 jumps to get to 9.
If we flip the addends in the equation 12+6= what is our new equation?
Solve.
6+12=
6+12 or 12+6=18.
What is a fact family for 8+9=17
9+8=17
17-8= 9
17-9= 8
I know 7+7=14. So, what is 7+8?
15.
I know 7+7=14. So, 7+7+1=15.
Use a ten frame to solve.
4+7=
11.
We move 3 counters to make a 10. There is 1 left over. So, 10+1=11.
Use a number line to count on.
14-5=
9.
Starting at 5, it takes 9 jumps to get to 14.
Is the math equation 1+2? the same as 2+1?
Yes. We can switch our addends to add in any order.
Both equations give us the answer 3.
Make your own fact family with answers within 20.
Answers may vary.
I know 8+8=16. So, what is 8+9?
17.
I know 8+8=16. So, 8+8+1=17.
Use a ten frame to solve.
8+5=
13.
We move 2 counters to the first ten frame to make 10. Then you have 3 left. 10+3=13.
Use a number line to solve.
18-9=
9.
Starting at 9, it takes 9 jumps to get to 18.
Is 15+3 the same as 3+15?
Yes. We can flip our addends and add in any order.