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Learn to solve add to with change unknown math stories with addition and relate to subtraction. Solve add to with change unknown word problems with addition, and relate to subtraction. Model with materials, and write corresponding number sentences.

Introducing subtraction as an unknown addend in Grade 1 involves helping students understand that subtraction is related to addition and that they can use their addition knowledge to solve subtraction problems. Here’s a step-by-step approach:

- Foundation in Addition:

Start by reinforcing the concept of addition. Ensure that students are comfortable with addition facts and can understand addition as combining or putting together. - Introduction to Subtraction:

Introduce subtraction as the opposite or inverse of addition. Explain that subtraction is about taking away or finding the missing part. - Unknown Addend Concept:

Explain the concept of subtraction as an unknown addend. For example, in the subtraction problem 5 - 3 = ?, ask students to find the missing addend that, when added to 3, gives 5. - Concrete Examples:

Use concrete examples to make the concept tangible. For instance, if you have a group of 5 objects and you take away 3, ask, “How many more do we need to make 5?” This reinforces the idea of finding the missing part. - Visual Representations:

Utilize visual aids such as drawings or diagrams to represent subtraction with unknown addends. For example, draw five apples and cross out three, asking students how many are left. - Number Line Exploration:

Introduce the use of a number line to represent subtraction with unknown addends. For instance, starting at 3 and moving forward to 5 represents the missing addend. - Word Problems:

Present word problems that involve subtraction with unknown addends. Use relatable scenarios to make it more engaging for students. - Hands-On Activities:

Engage students in hands-on activities where they physically manipulate objects to solve subtraction problems with unknown addends. This could involve counters, cubes, or other manipulatives. - Practice with Simple Equations:

Practice with simple equations, such as 7 - ? = 4. Encourage students to think about what number, when added to 4, results in 7. - Reinforce Understanding:

Reinforce the understanding that subtraction is not just about taking away but also finding the missing part in an addition scenario. - Verbal Communication:

Encourage students to use appropriate language when explaining subtraction with unknown addends. Phrases like “What do I need to add to…” or “How many more to make…” can be reinforced.

By connecting subtraction with unknown addends to addition and providing concrete examples and visual representations, Grade 1 students can develop a deeper understanding of subtraction and its relationship to finding missing parts in addition problems.

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Subtraction as an Unknown Addend Worksheet #1

Subtraction as an Unknown Addend Worksheet #2

There are ten **subtraction within 10** worksheets.

Subtract 0 or 1 (eg. 7 - 0, 8 - 1)

Subtract all or 0 (eg. 9 - 9, 9 - 0)

Subtraction as an Unknown Addend

Missing Subtrahend (eg. 6 - __ = 4)

Missing Minuend (eg. __ - 3 = 5)

Missing Number in Subtraction

Subtract from 9

Subtract from 10

Subtraction with numbers within 10 (eg. 8 - 2)

Subtraction Word Problems within 10

Subtraction as an Unknown Addend Lesson

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