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Number and Operations in Base 10: Add Two-Digit Numbers CCSS 2.NBT.6 Worksheets & Activities

add up to four two-digit numbers using strategies based on place value and properties of operations

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When adding numbers up to four two-digit numbers, we can simply decompose the addends and add by place values.

See the fact file below for more information on adding two-digit numbers or alternatively, you can download our 27-page Number and Operations in Base 10: Add Two-Digit Numbers within 100 worksheet pack to utilise within the classroom or home environment.

Key Facts & Information

Learning Objective

At the end of the lesson, the student will be able to add up to four two-digit numbers using strategies based on place value and properties of operations.

A Note for the Teacher

When adding up to four two-digit numbers, take note of the following:

  • Decompose the addends into tens and ones
  • Remember that adding means having a value that is greater than both addends
  • Always start adding from the ones, then tens
  • Repeat the process for the third and fourth addends

Theory

When adding numbers up to four two-digit numbers, we can simply decompose the addends and add by place values.

  • Consider 56 + 21 + 18 + 44:
    First, decompose 48 and 34 into place values.
    56 = 5 tens + 6 ones = 50 + 6
    21 = 2 tens + 1 ones = 20 + 1
    18 = 1 tens + 8 ones = 10 + 8
    44 = 4 tens + 4 ones = 40 + 4
  • Next, add the place values.
    5 tens + 2 tens + 1 tens + 4 tens = 50 + 20 + 10 + 40 = 120
    6 ones + 1 ones + 8 ones + 4 ones = 6 + 1 + 8 + 4 = 19 
  • Then, decompose the two sums again into place values and add them.
    100 + 20 + 10 + 9 = 139
  • You can also solve it vertically:

Next,

Lastly,

Number and Operations in Base 10: Add Two-Digit Numbers Worksheets

This is a fantastic bundle that includes everything you need to know about Number and Operations in Base 10: Add Two-Digit Numbers 27in-depth pages. These are ready-to-use worksheets that align with the Common Core code 2.NBT.6 for Adding Two-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: Add Two-Digit Numbers CCSS 2.NBT.6 Worksheets & Activities: https://kidskonnect.com - KidsKonnect, September 5, 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.