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: Problem 1
Estimate the following quotient. Then compute it.
$$486\div79$$
Problem 2
Divya is trying to solve
$$369 ÷ 46$$
. She estimates the quotient to be
$$369\div46 \approx 350 \div 50 = 7$$
. She starts to compute below:
[IMG]
a.   What do you notice about Divya's work so far? What do you wonder?
b.   Based on what you noticed and wondered about Divya's work, find the solution to
$$369 \ ÷ \ 46$$
.
Problem 3
723 students were divided equally into teams of 94 students for field day. Any students left over after making as many groups of 94 as possible will just be a smaller team. How many students will be on a team smaller than 94, if any?


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