Subtraction Strategies
Presentation
•
Mathematics
•
2nd Grade
•
Hard
Joseph Anderson
FREE Resource
13 Slides • 9 Questions
1
I Can Use Mental Math Strategies For Subtraction.
Apply It
2
Example: Read IT
Kendra has some strawberries. She eats 5 of them. Now she has 8 strawberries. How many strawberries did Kendra start with?
3
Write an equation with an unknown number. You can show the numbers in a number bond.
? - 5 = 8
4
Kendra eats 5 strawberries. Then she has 8 strawberries. Add 8+5 to find the unknown number that she started with.
8+5=13. So, 13-5=8
5
Apply It- Worksheet page 45 or notebook
Greg has 18 dollars. He spends 9 dollars on a game. How much money does Greg have left?
(show you work)
6
Multiple Choice
7
Find 12-8 by counting on.
show your work on your worksheet or notebook.
8
Multiple Choice
9
Now let us review our answer.
What number did you start with?
10
What do you know about all fact Families?
Stop and think!!! Then share!!!
11
Multiple Select
Which equations would be in the fact family for the number bond?
12
Open Ended
Lily chose 19=12+7 as the correct answer. How did she get that answer?
13
Lily chose 19=12+7 as the correct answer. How did she get that answer?
Now let's discuss what you think on how Lily got her answer.
14
Multiple Choice
15
I Can Practice Using Mental Math Strategies For Subtraction
Following along worksheet page 47 and 48
16
Eli buys 12 oranges. He uses 7 of them to make a fruit salad. How many oranges does he have left?
Think about how making ten can help you solve this problem. Write it in your notebook or on your worksheet.
17
Open Ended
18
Leti has some stickers. She gives 10 stickers to her bother. Leti has 10 stickers left. How many stickers did Leti have to begin with?
Make you number sentence.
19
Multiple Choice
20
Sonia has 15 toys. She puts 8 of them on the self. How many does she have left?
Think about what fact family problems could you use to solve this problem.
21
Multiple Select
22
Multiple Choice
I Can Use Mental Math Strategies For Subtraction.
Apply It
Show answer
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