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 1
Solve. Show or explain your work.
a.      ________ = 32,010 – 2,546
b.   829,403 = 175,368 + _____________
Problem 2
A company plans to give free stickers to 100,000 customers. On the first day of the giveaway, they give free stickers to 6,512 customers. How many stickers do they still have to give away? Show or explain your work.


aligns: no