Understand subtraction as an unknown-addend problem. For example,
subtract 10 – 8 by finding the number that makes 10 when added to 8.
Name |
Description |
Let’s Find the Missing Addend | This lesson will strengthen student understanding of the relationship between addition and subtraction equations. Students will use counters and part-part whole boards to model restating subtraction equations as addition equations with a missing addend. |
Help Amelia Bedelia Look for the Missing Addend | This lesson introduces the relationship between the related subtraction and addition in fact families and helps students understand that they can use the missing addend to help find the difference in related subtraction problems. |
Mystery Bag to 12 | This lesson deals with finding an unknown number in a subtraction equation by thinking addition and counting on. It utilizes the part-part-whole organizer and manipulatives to support the learning of students. |
Thinking Addition to Solve Subtraction Problems | Students will use the knowledge of Sums of Ten and apply that skill to solve related subtraction problems. Students will learn the strategy Thinking Addition to solve subtraction problems. |