Lesson: Subtracting by Adding with Numbers up to 10 Mathematics • 1st Grade
In this lesson, we will learn how to solve subtraction problems by finding the missing part in an addition expression with numbers up to 10.
Emma built 7 sandcastles on the beach. The tide came in and washed some of them away. There are 2 left and she wants to know how many were washed away.
Which of these number sentences does she need to solve?
Which of these addition facts can help her solve the problem?
How many sandcastles were washed away?
Michael has 5 pencils in a cup. He takes some pencils out. There are 2 pencils left in the cup. Find the number of pencils he has taken out.
Ethan has 7 flowers. He gives his friend Sophia 2 flowers.
Write an addition sentence to find how many flowers Ethan has.
How many flowers does Ethan have?