MA19.1.4

Mathematics (2019) Grade(s): 1

MA19.1.4

Explain subtraction as an unknown-addend problem.

Unpacked Content

Knowledge

Students know:
  • The relationship between addition and subtraction.
  • how to explain subtraction as an unknown addend.

Skills

Students are able to:
  • use symbols such as blanks, boxes, or letters to represent unknown quantities in equations.
  • Communicate the connections between subtraction and addition.
  • Use the inverse relationship between addition and subtraction to find differences.
  • Choose and apply addition and subtraction strategies to accurately determine sums and differences within 20.

Understanding

Students understand that:
  • addition and subtraction have an inverse relationship that can be used to solve problems.

Vocabulary

  • Addend

COS Examples

Example: subtracting 10 - 8 by finding the number that makes 10 when added to 8

Aligned Learning Resources

Where Oh Where Has My Addend Gone?
It's Picture Day! The Odd Squad
How to Feed the Hamster: The Odd Squad
Making a Difference Solving Word Problems
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