Subtracting multiples of 10
15
Subtracting multiples of 10
-
Upload
carol-gill -
Category
Documents
-
view
30 -
download
2
description
Subtracting multiples of 10. 1.NBT.6. - PowerPoint PPT Presentation
Transcript of Subtracting multiples of 10
Subtracting multiplesof 10
1.NBT.6 Subtract multiples of 10 in the range 10-90
from multiples of 10 in the range of 10-90 (positive or zero differences), using concrete model or drawings and strategies based on place value, properties of operations, and/or
the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used.
Ruby has 50 books that she wants to read over the summer. She has read 20. How many more books does Ruby have to read?
Can Kala solve this problem using ten frames?
50-20 = 30
20 30 40 50
Can Colby solve this problem using a number line?
50403020
50 – 20 = 30
20 + 30 = 50
Which ways show 50 - 20 = 30
1.
2. 20 + ? = 50
3.
20 30 40 50
There are 40 flowers in the vase at the store. Rosa bought 20 flowers to give to her mom for her birthday. How many flowers are left in the vase?
Rosa solved it this way:
40 – 20 = 20
Is this correct?Agree or Disagree
Juan bought 70 pieces of candy to share with his friends. He decides to give 50 pieces of candy away.
20 110
50 804030 60 70 90 100 120
Is this correct? Agree or Disagree
Juan solves his problem this way:
50 + 70 = 120
Leo found 40 pennies in the park. He decided to share them with his friend Mike. Leo gave Mike 10 pennies. How many pennies does Leo have now?
Leo solved the problem this way:
40 – 30 = 10
Is this correct?Agree or Disagree
The clown had some balloons. He gave away 30 balloons. Now the clown has 40 balloons. How many balloons did the clown have?
30 605040 70 80
Is the clown correct?
The clown solved the problem this way:
0 9030 602010 40 50 70 80 100
Use your Number Line to Show:
60 – 10 = 50
0 9030 602010 40 50 70 80 100
Use your Number Line to Show:
90 – 50 = 40
0 9030 602010 40 50 70 80 100
Use your Number Line to Show:
30 – 30 = 0
0 9030 602010 40 50 70 80 100
Use a double Number Line to Show: 100 – 70 = 30100 = 70 + 30
0 9030 602010 40 50 70 80 100
Dan spent 40¢ on lunch.
What do you think he bought?
Hot dog30¢ Apple
10¢Drink 20¢
Ice cream cone 10¢
