# 2.7B Use An Understanding Of Place Value To Determine The Number That Is 10 Or 100 More Or Less Than A Given Number Up To 1200 Lesson Plan for 2nd Grade Students

## Topic: Understanding place value

### Objectives & Outcomes

• Students will be able to identify the Place Value Marks (tens, ones, hundredths) and use them to count to 100.
• Students will be able to use their understanding of place value to determine the number that is 10 or 100 more or less than a given number up to 1200.

### Materials

• Pencils
• Paper
• Place Value Counters (optional)

### Warm-Up

• Review the Place Value Marks (tens, ones, hundredths) and have students practice writing them.
• Review counting to 100 and have students practice counting out loud with the class.
• Ask students to count to 100 by tens, asking them to use the Place Value Marks as they count.

### Direct Instruction

• Show students a number less than 100 and have them identify the Place Value Marks in the number.
• Have students identify the tens and ones place in the number and write the corresponding numbers on the board.
• Have students add the two numbers together to find the total.
• Repeat this process with numbers up to 100, having students use the Place Value Marks and write the corresponding numbers on the board.

### Guided Practice

• Show students a number less than 100 and have them identify the Place Value Marks in the number.
• Have students identify the tens and ones place in the number and write the corresponding numbers on the board.
• Have students subtract the second number from the first to find the difference.
• Repeat this process with numbers up to 100, having students use the Place Value Marks and write the corresponding numbers on the board.

### Independent Practice

• Have students work in pairs to find the difference between two numbers up to 100.
• Have students use the Place Value Marks to identify the numbers and write them on the board.
• Encourage students to use the strategy of subtracting the second number from the first to find the difference.
• Have students share their answers with the class and explain their thinking.

### Closure

• Review the concept of place value and the use of the place value marks to identify numbers.
• Ask students to share one thing they learned about place value during the lesson.

### Assessment

• Observe students during independent practice to assess their understanding of place value.
• Review students' written responses to questions about place value.
• Have students complete a brief quiz or worksheet to assess their ability to use place value marks to identify numbers.