Neighbor numbers to 1,000

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Students learn to determine the neighbor numbers of numbers from 100 to 999. They know to count one back and one forward to determine the neighbor number.

2.NBT.A.2

Discuss with students that it is important to know neighbor numbers of a given number because they know which number comes before and after a given number. They then know, for example, which seats belong next to each other.

Ask students to sit in pairs. Have them write the numbers from 1 to 100 in pairs by turns. The student who does not write the number must name the number written down. Next practice as a class counting to 1,000. First count to 200, then back to 500 and then up to 900.

Explain that neighbor numbers are the numbers that come one before and one after a given number. Use the houses to help explain the idea of neighbors. Explain how to find the neighbor numbers by counting one back and one forward. Read the story and ask students which ticket numbers Emma should buy.

Check that students understood neighbor numbers to 1,000 by asking the following questions:

- What is a neighbor number?

- How do you find a neighbor number?

- Does every number have a neighbor number?

Students first practice selecting neighbor numbers from given number, then they must determine neighbor numbers and finally they must give neighbor numbers for two numbers.

Check that students are able to explain the term neighbor numbers. Tell students that neighbor numbers are the numbers that come before and after a given number on the number line. Emphasize that it is useful to know neighbor numbers so you not only know the order, but know which number is next. Check that students can determine the neighbor numbers of a given number by counting one back and one forward. Ask students to find the neighbor numbers of the numbers given on the interactive whiteboard and to circle them in the correct colors.

Students who have difficulty determining neighbor numbers to 1,000 likely have difficulty counting to 1,000. Have these students practice counting forwards and backwards to 1,000. They can also be supported by using the number line to visualize their counting. Students who are comfortable with neighbor numbers to 1,000 can be challenged to find neighbor numbers up to 10,000.

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Lesson

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