standard_description: Solve two-step word problems using the four operations. Represent these problems using equations with a letter standing for the unknown quantity. Assess the reasonableness of answers using mental computation and estimation strategies including rounding. (This standard is limited to problems posed with whole numbers and having whole number answers; students should know how to perform operations in the conventional order when there are no parentheses to specify a particular order (Order of Operations).)
problem_activity: Problem 1
Estimate the mass of the following objects in grams or kilograms, depending on which is more appropriate. Then measure their actual mass using your tool(s).
a.   Pair of scissors
b.   Thumbtack
c.   Ruler
d.   Textbook
Problem 2
What is the mass of each of the following objects, according to the reading on the scale? For any measurement that isn’t exact, make your best estimate.
a.
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b.
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c.
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aligns: no