Common Core State
3.MD.C5
Recognize area as an attribute of plane figures and understand concepts of area measurement.
October 1, 20183.MD.C5a
A square with side length 1 unit, called “a unit square,” is said to have “one square unit” of area, and can be used to measure area.
October 1, 20183.MD.C5b
A plane figure which can be covered without gaps or overlaps by n unit squares is said to have an area of n square units.
October 1, 20182.NBT.B8
Mentally add 10 or 100 to a given number 100-900, and mentally subtract 10 or 100 from a given number 100-900.
October 1, 20182.NBT.B9
Explain why addition and subtraction strategies work, using place value and the properties of operations.1
October 1, 20182.OA.A1
Use addition and subtraction within 100 to solve one- and two-step word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem.1
October 1, 20182.OA.B2
Fluently add and subtract within 20 using mental strategies.2 By end of Grade 2, know from memory all sums of two one-digit numbers.
October 1, 20182.NBT.A1b
The numbers 100, 200, 300, 400, 500, 600, 700, 800, 900 refer to one, two, three, four, five, six, seven, eight, or nine hundreds (and 0 tens and 0 ones).
October 1, 20182.NBT.A3
Read and write numbers to 1000 using base-ten numerals, number names, and expanded form.
October 1, 20182.NBT.A4
Compare two three-digit numbers based on meanings of the hundreds, tens, and ones digits, using >, =, and < symbols to record the results of comparisons.
October 1, 20182.NBT.B5
Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
October 1, 2018