1.NBT.C.6

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- 1.NBT.C.4Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of 10, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used. Understand that in adding two-digit numbers, one adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten.
- 1.NBT.C.5Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.
- 1.NBT.C.6Subtract multiples of 10 in the range 10-90 from multiples of 10 in the range 10-90 (positive or zero differences), using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used.

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## 1.NBT.C.6

## Subtract multiples of 10 in the range 10-90 from multiples of 10 in the range 10-90 (positive or zero differences), using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used.

12 Lesson(s)

### Adding and Subtracting Multiples of Ten

1st Grade Math »
Unit: The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less

1st Grade Math »
Unit: The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less

### Pick Your Ten

1st Grade Math »
Unit: The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less

1st Grade Math »
Unit: The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less

### Speed Date!

1st Grade Math »
Unit: Adding and Subtracting: Base Ten

1st Grade Math »
Unit: Adding and Subtracting: Base Ten

### How Many On My Plate? (Addition)

1st Grade Math »
Unit: The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less

1st Grade Math »
Unit: The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less

### Subtract Tens

1st Grade Math »
Unit: Two Digit Addition and Subtraction

1st Grade Math »
Unit: Two Digit Addition and Subtraction

### How Many On My Plate? (Subtraction)

1st Grade Math »
Unit: The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less

1st Grade Math »
Unit: The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less

### End Of Unit Assessment

1st Grade Math »
Unit: The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less

1st Grade Math »
Unit: The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less

### Will you be my Valentine?

1st Grade Math »
Unit: Adding and Subtracting: Base Ten

1st Grade Math »
Unit: Adding and Subtracting: Base Ten

### Mid Unit Check In

1st Grade Math »
Unit: The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less

1st Grade Math »
Unit: The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less

Big Idea:

#### This task will offer a challenging activity and will also act as a piece of formative assessment as you look deeper into how well they can add or subtract ten from a number and plan your instruction from here.

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Resources
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Reflections
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### Knockin It Out of the Park by Subtracting Ten

1st Grade Math »
Unit: Place Value

1st Grade Math »
Unit: Place Value

### Continuing to build mental math skills

1st Grade Math »
Unit: Place Value

1st Grade Math »
Unit: Place Value

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