standard_description: Classify two-dimensional figures based on the presence or absence of parallel or perpendicular lines, or the presence or absence of angles of a specified size. Recognize right triangles as a category, and identify right triangles.
problem_activity: Problem 1
Sets of utensils for lunch come in cartons of ten. Those cartons of ten come in boxes of ten. Those boxes of ten come in packages of ten.
Ms. Ruizdeporras has 4 packages, 2 boxes, 5 cartons, and 9 individual sets. After one week, she has 2 packages, 1 box, 7 cartons, and 1 individual sets left. How many sets of utensils did Ms. Ruizdeporras use in one week?
Problem 2
Estimate. Then solve.
a.   __________ = 22,397 – 3,745
b.   214,290 = 193,007 + __________
Problem 3
The paper mill produced 73,458 boxes of paper this month. Last month, it produced 65,606 boxes of paper. How many more boxes of paper did it produce this month compared to last month?


aligns: no