Neighboring Tens numbers

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Students learn what neighboring tens numbers are and can determine the neighboring tens numbers of numbers between 11 and 99 by determining which tens a number sits between.

1.NBT.A.1

Discuss with students that it is important to know neighboring tens numbers, because you learn where a number sits. Explain that the mail carrier then knows where a letter needs to go.

Set students in pairs with two sets of number cards from 1-9. The first student selects two cards and creates a number. They set it on the table and says the number out loud. Their neighbor checks that they said it correctly, and then they get to create a number and say it out loud.

Start with explaining what tens are, and what tens numbers are. A tens is a group of 10 and always ends on a 0. Say the tens numbers aloud. Explain that neighboring tens number are the tens numbers that a given number sits between. Using the number line, show that 34 sits between 30 and 40. Next explain that you can find the neighboring tens numbers by putting a number on the number line and looking which tens number comes before the given number, and which comes after. Next ask students if they can determine the neighboring tens numbers of the given numbers and write them down.

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

- What is a neighboring tens number?

- How do you find a neighboring tens number?

- Do all numbers have neighboring tens numbers?

Students first practice finding neighboring tens numbers with numbers represented on a number line. Next they must select the neighboring tens from other numbers and finally they need to determine the neighboring tens numbers on their own.

Check that students are able to explain the idea of neighboring tens numbers. Tell students that neighboring tens numbers are the tens numbers that a given number sits between. Emphasize that it is useful to know this to know where to find a number. This is useful for the mail carrier, because they use the numbers to find your house. Check that students can determine the neighboring tens numbers of the given numbers by placing the number on the number line.

If students have difficulty with determining neighboring tens numbers, they can be helped by using a number line for every exercise.

number cards from 1-9; one set per student

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