Count on and Turn Around Facts
Which numbers are the addends?
4+8=12
4 and 8 are the addends
What is a double fact?
a double fact is an addition equation where a number is added to itself, such as 3 + 3 = 6.
What subtraction means?
What is the sign for subtraction?
Subtraction means your taking away something
-
10+7=
17
2 x 3 =
6 x 1 =
6
Jake draws 9 birds. Bobbi draws 2 birds. How many birds do they draw in all?
Which shows how to "count on" to solve the problem?
9 , 10 , 11
What is a near double fact?
Near doubles is a mental math strategy where you solve addition problems by relating them to known doubles facts, often by adding one more to a double.
Example 3+4=7
Count back 5 times starting with 10
10 in your head
9 , 8 , 7 , 6 , 5
What is the sum?
4+7= 10+1=
11
2 x 2 =
2 x 4 =
4
8
8+3=
_+_=
12
3+8=12
How could you use the doubles fact 7+7 to find 7+9?
7+9 is two more than 7+7
7+7,{ 7+8, 7+9}
Solve the equations
18-9= 8-5= 7-3=
9
3
4
15 (+) or (-) 3 = 18
(+) PLUS
7 + 7 =
7 x 2 =
14
14
Solve 15 - _= 6
What is the addition equation?
_+_=
15-9=6
9+6=15
Which double fact will help you find 8+9
8+8 double fact
Draw a number line and find
17-4=
13
16 (+) or (-) 6 = 10
(-) MINUS
8+8=
8 x 2 =
16-8=
16
16
8
When you flip the addends, the sum DOESN'T change is called what?
Turn Around Facts
or Turn Around Friends
Choose all that have a sum of 16
8+6 8+8 9+6 9+7 10+6
8+8
9+7
10+6
Make a Ten Frame Mat and Solve
16-9
7
Make a Ten Frame
15-_=5
What is the addition fact?
10
5+10=15
12 x 11 or 8 x 11
132
88