Place value- numbers to 50 on the number line

Place value- numbers to 50 on the number line

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Students learn to place numbers from 31 to 50 on the number line. They learn the tens and ones that make up numbers to 50 and can jump to these numbers on the number line.

1.NBT.B.2

Discuss with students that it is important to know how the numbers to 50 are put together so you can use them in calculations later.

The interactive whiteboard has a row of numbers. A few of them are missing. Ask students to write them down and hold them up to check them as a class. Erase the boxes to see if they are correct. Next, show an amount on the board and ask students to skip count in 10s.

Show the tens and ones on the interactive whiteboard. Explain that tens are a group of 10 and ones are the numbers from 1 to 9. Show the MAB-blocks on the interactive whiteboard and/or show them in your classroom as well. Using the blocks, repeat the explanation of tens and ones. Show the TO-chart. Explain that the number 38 is made of 3 tens and 5 ones, and show how these jumps can be made on the number line. Point this out on the numbers next to the TO-chart. Show that you can also jump to 38 in a faster way by making jumps of 5 instead of jumps of 1. Practice as a class having students determine the tens and ones of a number. Discuss how to best jump to the number 46. Write the intermediate jumps on the interactive whiteboard. Next a few exercises are given in which students have to determine which number has been jumped to based on the given jumps on the number line.

Check that students know how to build numbers to 50 and place them on a number line by asking the following questions:

What are tens? How do you know?

What are ones? How do you know?

Which jumps would you make on the number line to reach a given number?

Jump to 40 on the number line.

Students are given ten questions in which they practice determining which number has been jumped to on the number line and are also asked to jump to a given number on the number line.

Discuss with students that it is important to know how numbers to 50 are put together, so you can calculate with them later. Check that students understand what tens and ones are and how they jump to a given number. To practice this have the students get into pairs. The interactive whiteboard shows a few numbers. The student pairs write their own number line and take turns jumping and must discuss with each other which jumps they should take. Ask the pairs to hold up their number lines to see how they decided to jump. Check if they jumped in an effective way.

Students who have trouble can be supported by a deeper understanding of tens and ones. Have them use manipulatives or MAB-blocks to visually show the tens and ones.

MAB-blocks

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