standard_description: Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.
problem_activity: Problem 4
Pre-unit
What is the value of the 6 in 618,923?
How many times greater is the value of the 6 in 618,923 than the 6 in 27,652?


aligns: no