Introduction to Place Value
1 Understanding Place Value
Show Brainpop Jr. video entitled Place Value with Annie and Moby.
Pause at :49 to check for understanding of the word "digit".
At the end of the video, ask students to turn and talk to someone near them to share something they learned from the video about place value.
Students watch video and interact in discussion.
2 Building Numbers with Base Ten Blocks
Have children open up the Number Pieces app. Explain that you will be using the app as a tool to build numbers using base ten blocks.
Review how to move pieces onto the workspace and how to use the writing tools to record numbers.
Give students 5 minutes to simply explore the tool before asking them to begin building numbers as a group.
Ask children to clear their workspace. Explain that you are going to say a number and you want them to show that number using ones and tens. Begin with single digit numbers.
After they have had practice moving cubes onto their workspace, begin building 2-digit numbers. Have them place 1 ten and 2 ones on their board. Ask children to record the number they've built on their workspace using the pencil to write. Ask for students to share their workspace with someone sitting next to them.
Have students add additional ones and record this new number.
QUESTION: Which digit changed when you added more ones?
ANSWER: The digit in the ones place.
After practicing with adding ones, have students add tens and record the new number.
QUESTION? Which digit changed when you added more tens?
ANSWER: The digit in the tens place.
Students will open the app and listen to a few basic directions about how to use the tool.
Students will have time to free explore the app before moving onto the group lesson of building numbers as a whole group.
Students will add cubes and then tens, following the teacher's directions.
3 Show What You Know
Ask children to build a number and record it on their workspace. Take a screenshot and upload it to Seesaw or to Padlet.
Build a 2-digit number using base ten blocks on the Number Pieces app. Record the number on the workspace. Take a screenshot and upload it to Seesaw or to Padlet.
4 How Many? Practice recognizing 2-digit numbers
Open Kahoot on student ipads. Type in code for First Grade Place Value game.
Key Standards Supported
Number And Operations In Base Ten
Count to 120, starting at any number less than 120. In this range, read and write numerals and represent a number of objects with a written numeral.
Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases:
10 can be thought of as a bundle of ten ones — called a “ten.” b.
The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones.
The numbers 10, 20, 30, 40, 50, 60, 70, 80, 90 refer to one, two, three, four, five, six, seven, eight, or nine tens (and 0 ones).
Compare two two-digit numbers based on meanings of the tens and ones digits, recording the results of comparisons with the symbols >, =, and <.
Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of 10, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used. Understand that in adding two-digit numbers, one adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten.
Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.
Subtract multiples of 10 in the range 10-90 from multiples of 10 in the range 10-90 (positive or zero differences), using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used.