MA19.1.2
Solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20 by using concrete objects, drawings, or equations with a symbol for the unknown number to represent the problem.
Solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20 by using concrete objects, drawings, or equations with a symbol for the unknown number to represent the problem.
UP:MA19.1.4
Vocabulary
- Addend
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.
