Ch. 1: Addition & subtraction within 1,000

Vocabulary

  • Associative Property of Addition: When the grouping of addends is changed, the sum is the same
  • Commutative Property of Addition: You can add two or more numbers in any order and get the same sum
  • Compatible Numbers: Numbers that are easy to compute mentally
  • Estimate: A number close to an exact amount
  • Identity Property of Addition: The sum of any number and zero is that original number
  • Pattern: A repeating or growing sequence that follows a rule
  • Round: To replace a number with another number that tells about how many or about how much

EVEN-ODD ADDITION RULES

Addition Table

Click the header link that says ADDITION TABLE to use an interactive one for your homework addition work.

100 chart

Click the image below to open an interactive 100 chart manipulative you can color on while counting.

  • Use this 100 chart to help with your addition and subtraction.

rounding

  • When rounding to the nearest 100, circle the hundreds place digit
  • When rounding to the nearest 10, circle the tens place digit.
  • Explore place value rounding with this online manipulative.

Addition properties