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Help students learn to fluently add within 100 using strategies based on place value, properties of operations, and/or the relationship between addition.
See the fact file below for more information on addition within 100 or alternatively, you can download our 23-page Number and Operations in Base 10: Addition within 100 worksheet pack to utilise within the classroom or home environment.
Key Facts & Information
At the end of the lesson, the student will fluently add within 100 using strategies based on place value, properties of operations, and/or the relationship between addition.
A Note for the Teacher
When adding within 100, take note of the following:
- You are dealing with up to two-digit addends
- Decompose the addends into tens and ones
- Remember that adding means having a value that is greater than both addends
- Vertically, always start adding from the ones, then tens
When adding numbers within 100, we can simply decompose the addends and add by place values.
- Consider 48 + 34:
First, decompose 48 and 34 into place values.
48 = 4 tens + 8 ones = 40 + 8
34 = 3 tens + 4 ones = 30 + 4
- Next, add the place values.
4 tens + 3 tens = 70 = 40 + 30
8 ones + 4 ones = 12 = 8 + 4
- If the sum of the one place becomes a two-digit, decompose again.
12 = 1 tens + 2 ones = 10 + 2
- Then, add by place values again
70 + 10 = 80
- Lastly, put them all together.
80 + 2 = 82
- You can also solve it vertically:
Numbers and Operations in Base 10: Place Value – Comparing 3 Digit Numbers Worksheets
This is a fantastic bundle that includes everything you need to know about Numbers and Operations in Base 10: Place Value – Comparing 3 Digit Numbers 23 in-depth pages. These are ready-to-use worksheets that align with the Common Core code 2.NBT.5(1) for Comparing 3 Digit Numbers.
Complete List of Included Worksheets
- A lesson plan
- Warm-up activity
- Math theory explained
- Assisted learning activities
- Independent learning activities
- Extension activities and games
- Answer keys
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Link will appear as Number and Operations in Base 10: Addition within 100 CCSS 2.NBT.5(1) Worksheets & Activities: https://kidskonnect.com - KidsKonnect, September 4, 2021
Use With Any Curriculum
These worksheets have been specifically designed for use with any international curriculum. You can use these worksheets as-is, or edit them using Google Slides to make them more specific to your own student ability levels and curriculum standards.