Lesson: Checking Two-Digit Subtraction Problems by Adding Math Connects • Grade 2 • Volume 1 • Student Edition • enVisionmath2.0 • Grade 2 • Volume 1 • Common CoreMathematics
In this lesson, we will learn how to use addition to check subtraction and identify the related addition equation that can be solved to check the answer.
Sample Question Videos
Worksheet: 10 Questions • 2 Videos
Look at the expression .
Choose a strategy and solve the expression.
Hint: You can use the vertical column method.
Check your answer using the inverse operation. Remember that inverse means the opposite.
Which addition expression shows the opposite calculation you need to carry out?
Sophia and Benjamin have been asked to solve .
Sophia solves it and gets an answer of 51.
Benjamin solves it and gets an answer of 31.
Who is correct? Use the vertical column method to find out.
Check your answer using the inverse operation.
What number do you add to 45 to get 96?
If you know that , find the total of without calculating.