Unit 5, Lesson 7
Does It Make a New Ten?
Grade 1
Warm-up
Which 3 go together?
Activity 1
Jada likes to look for ways to make a new ten when she adds.
Can she make a new ten when she adds to find the value of these sums?
Circle "Yes" or "No."
-
Does the expression make a new ten?
Yes
No
Explain how you know.
Find the value.
Write equations to show how you found the value of the sum.
-
Does the expression make a new ten?
Yes
No
Explain how you know.
Find the value.
Write equations to show how you found the value of the sum.
-
Does the expression make a new ten?
Yes
No
Explain how you know.
Find the value.
Write equations to show how you found the value of the sum.
-
Does the expression make a new ten?
Yes
No
Explain how you know.
Find the value.
Write equations to show how you found the value of the sum.
Activity 2
Lin’s brother spilled water on her math work!
Figure out what number Lin wrote.
- Lin wrote a 1-digit number that can make a new ten when you find the value of the sum.
What could Lin’s number be?
Write equations to show your thinking. - Lin wrote a 1-digit number that can not make a new ten when you find the value of the sum.
What could Lin’s number be?
Write equations to show your thinking. - Lin wrote a 2-digit number that can make a new ten when you find the value of the sum.
What could Lin’s number be?
Write equations to show your thinking. - Lin wrote a 2-digit number that can not make a new ten when you find the value of the sum.
What could Lin’s number be?
Write equations to show your thinking. -
How do you know if you can make a new ten when you are finding the value of a sum?
Student Section Summary
We added one-digit numbers and two-digit numbers.
We used different methods to add.
We learned you can think of counting on to make a new ten.
We also saw you can think of adding all the ones and then the tens.
Sometimes when you add the ones you might be able to make a new ten.