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Number and Operations in Base 10: Addition within 1000 CCSS 2.NBT.7(1) Worksheets & Activities

add within 1000 by understanding that in subtracting three-digit numbers, one adds hundreds and hundreds, tens and tens, ones, and ones

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When adding numbers within 1000, we can simply decompose the addends and add by place values.

See the fact file below for more information on addition within 1000 or alternatively, you can download our 27-page Number and Operations in Base 10: Addition within 1000 worksheet pack to utilise within the classroom or home environment.

Key Facts & Information

Learning Objective

At the end of the lesson, the student will add within 1000 by understanding that in subtracting three-digit numbers, one adds hundreds and hundreds, tens and tens, ones, and ones.

A Note for the Teacher

When adding within 1000, take note of the following:

  • You are dealing with up to three-digit addends
  • Decompose the addends into hundreds, tens, and ones
  • Remember that adding means having a value that is greater than all addends
  • Vertically, always start adding from the ones, then tens, then hundreds

Theory

When adding numbers within 1000, we can simply decompose the addends and add by place values.

  • Consider 327 + 256:
    First, decompose 321 and 256 into place values.
    321 = 3 hundreds + 2 tens + 7 ones = 300 + 20 + 7
    256 = 2 hundreds + 5 tens + 6 ones = 200 + 50 + 6
  • Next, add the place values.
    3 hundreds + 2 hundreds = 500 = 300 + 200
    2 tens + 5 tens = 70 = 20 + 50
    7 ones + 6 ones = 13 = 7 + 6
  • If the sum of any place becomes a two-digit, decompose again.
    13 = 1 tens + 3 ones = 10 + 3
  • Then, add by place values again and put them all together.
    500 + 70 + 10 + 3 = 583
  • You can also solve it vertically:

Next,

Next,

Lastly,

Number and Operations in Base 10: Addition within 1000 Worksheets

This is a fantastic bundle that includes everything you need to know about Number and Operations in Base 10: Addition within 1000 27in-depth pages. These are ready-to-use worksheets that align with the Common Core code 2.NBT.7(1) for Addition within 1000.

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 1000 CCSS 2.NBT.7(1) 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.