Neighbor numbers of tens

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Students learn what neighbor numbers are and can determine the neighbor numbers of tens numbers (10,20, 30, etc) to 100.

K.CC.A.1

K.CC.A.2

Discuss with students that it is important to know neighbor numbers, because you know which numbers come before and after a given number. An example is if you have a game and have to count points to count one back or one more.

Ask students to take turns counting forward or backward from the numbers shown on the interactive whiteboard.

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 neighbor numbers by counting one back, and counting one more. Ask students what the neighbor numbers of 40 and 70 are. Drag the grey boxes to check if they are correct or incorrect.

Check that students understand neighbor numbers of tens by asking the following questions:

- How do you find a neighbor number?

- Do all numbers have a neighbor number?

Students first practice with determining which neighbor number comes first, then they practice finding the neighbor number that comes after. Finally they practice giving both neighbor numbers.

Check that students are able to explain the idea of neighbor numbers. Tell students that the neighbor numbers of a given number are the numbers just before and just after a number on the number line. Emphasize that it is useful to to know neighbor numbers so you know which one comes before, and which is after. Check that students understand determining neighbor numbers counting one back and one more by using a story involving neighbor numbers.

Students who have difficulty with neighbor numbers will likely have problems counting to 100. Encourage these students to practice counting forwards and backwards to 100, and have them use the number line as visual support. Students who are comfortable with neighbor numbers of tens can be encouraged to practice neighbor numbers to 1,000.

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