Chapter 2 – Adding/Subtracting/Rounding Decimals

Learning Targets:

  • Students will be able to add and subtract whole numbers and decimals up to the billions and down to the thousandths place values.
  • Students will be able to round numbers using a variety of strategies (place value, whole number, compatible numbers).


  • estimate: a number close (not exact) to an amount or value, a good guess using what you know
  • rounding:change an exact number to an easy to use number that is very close to the exact number 656 to hundreds = 700 
  • compatible numbers: pairs of numbers you can easily work with in your head

Interactive Math Games:




Printable Practice: