Doubles
True or False: 8 + 8 = 20
False
When you add two numbers together, does the number get BIGGER or SMALLER?
BIGGER
Find 10 - 3.
7
Write the fact family for the numbers 2, 3, and 5.
2 + 3 = 5
3 + 2 = 5
5 - 2 = 3
5 - 3 = 2
Dan has 3 smiley face stickers. Josh has 5 smiley face stickers. Which equation shows how many smiley face stickers they have in all?
A. 8 = 3 + 5
B. 3 = 5 + 8
C. 5 = 2 + 3
D. 3 = 2 + 1
A. 8 = 3 + 5
Which is a doubles fact?
A. 6 + 2 = 8
B. 8 + 0 = 8
C. 7 + 7 = 14
D. 3 + 2 = 5
Draw a number line and show how to count on to find 8 + 3. Then write the missing sum.
8 + 3 = ____
11
Draw a number line and solve 11 - 4.
True or False: This is a fact family.
8 + 0 = 8
0 + 8 = 8
8 - 0 = 8
8 - 8 = 0
True
Ms. Rosen has 3 cupcakes. She makes 7 more. How many cupcakes does she have now?
Ms. Rosen has 10 cupcakes now.
Write 3 double facts with the numbers 0 - 10.
0 + 0 = 0
1+ 1 = 2
2 + 2 = 4
3 + 3 = 6
4 + 4 = 8
5 + 5 = 10
6 + 6 = 12
7 + 7 = 14
8 + 8 = 16
9 + 9 = 18
10 + 10 = 20
Which number is 5 more than 4?
Which number is 4 fewer than 8?
4
What is a related addition fact to 13 - 3 = 10?
10 + 3 = 13 OR 3 + 10 = 13
Lis has 12 markers. She gives 7 to her students. How many markers does Lis have left?
5 markers
Sarah has 6 apples and 6 bananas. How many pieces of fruit does she have?
Is 3 + 5 the same as 5 + 3? Explain.
Yes, order doesn't matter when you add
There are 19 limes on the table. 10 fall on the floor. Nick says there are 9 limes left on the table. Do you agree or not agree with Nick's thinking?
Use pictures, words, or an equation to explain.
Agree 19 - 10 = 9
Which two related addition facts can help you solve the subtraction problem?
13 - 8 = ?
A. 8 + 7 = 15
B. 5 + 3 = 8
C. 8 + 5 = 13
D. 5 + 8 = 13
C and D!
Jenna and Zoe have 8 stickers in all. Jenna has 3 stickers. Which two equations show the story?
A. 3 + 6 = 9
B. 3 + 5 = 8
C. 7 + 1 = 8
D. 5 + 3 = 8
B and D
Use a doubles fact to help you find 4 + 5. Find the missing number.
____ + ____ = _____
so
4 + 5 = _____
4 + 4 = 8
so
4 + 5 = 9
How could you use addition to solve 16 - 9 ?
9 + 7 = 16
Whole: ____
Part: _____
Part: _____
Whole 9
Part 1, 8
What are the 3 other related facts to 11 - 1 = 10
11 - 10 = 1
10 + 1 = 11
1 + 10 = 11
There are 8 penguins. Some go inside an igloo and some stay outside the igloo.
If there are 5 penguins inside the igloo, how many are outside the igloo?
BONUS POINT:
What is another combination of where the penguins could be?
0 outside, 8 inside
1 outside, 7 inside
2 outside, 6 inside
3 outside, 5 inside
4 outside, 4 inside
5 outside, 3 inside
6 outside, 2 inside
7 outside, 1 inside
8 outside, 0 inside