Students practice applying and using the addition properties as they explore the concepts and skills of measurement, specifically mass.

EXPECTATIONS
	Use this list of Expectations to assess students on the key concepts and skills in this unit.
E1	Compose and decompose numbers using ones, fives, tens, twenties, fifties, and hundreds.
E2	Use words and symbols (e.g., <, >, =) to show comparisons of quantities.
E3*	Compare and order quantities.
E4*	Recognize that different partitions of a number have the same total (e.g., 50 + 4 = 40 + 14).
E5*	Apply the properties of addition (e.g., commutative, associative) to write number sentences that represent mass.
E6	Solve addition and subtraction problems (e.g., part-whole, join, take away, compare) involving mass.
E7	Measure and compare the mass of objects using a two-pan balance and standard gram masses.
E8	Solve elapsed-time problems involving time measurements to the nearest five minutes.
E9	Read and write time to the nearest five minutes using analog and digital clocks.
E10	Make a scaled bar graph to find information about a data set.
E11	Read a data table or bar graph to find information about a data set.
E12*	Demonstrate fluency with the addition facts in Group F (8 + 6, 9 + 6, 9 + 7, 10 + 4, 10 + 5, 10 + 6, 10 + 7, 10 + 8, 9 + 8, 9 + 9).
E13*	Determine the unknown number in an addition or subtraction sentence relating three whole numbers for the facts in Group F.
	* Denotes Benchmark Expectation