standard_description: Subtract multiples of 10 in the range 10-90 from multiples of 10 in the range 10-90 (positive or zero differences), using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and 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