I have created ten questions on estimating sums and differences of whole numbers up to ten thousands. There are all multiple choice questions. Two of the questions have a number line for students to use.
This matches the rigor of VA SOL 4.4a estimating sums and differences of whole numbers.
Check out the rest of my products at https://www.teacherspayteachers.com/Store/Kris-Crowder-Va-Math-Interventionist
Email me at firstname.lastname@example.org if you have any questions.