standard_description: Mentally add 10 or 100 to a given number 100–900, and mentally subtract 10 or 100 from a given number 100–900.
problem_activity: Solve. Show or explain your work.
a.   4.62 ÷ 0.07
b.   51.2 ÷ 0.08
c.   2.91 ÷ 0.6


aligns: no