1st Grade Math (Pennsylvania PA Core)

2.1 Numbers and Operations

• CC.2.1.1.B.1 Extend counting to 120 from any number and read and write numerals for groups of objects.
• CC.2.1.1.B.2 Use tens and ones to compare two-digit numbers, recording with >, = and <.
• CC.2.1.1.B.3 Add within 100 and subtract multiples of 10 using models, drawings and place-value reasoning.

2.2 Algebraic Concepts

• CC.2.2.1.A.1 Solve addition and subtraction word problems within 20 with objects, drawings and equations.
• CC.2.2.1.A.2 Use properties of addition and see subtraction as a missing-addend problem.

2.3 Geometry

• CC.2.3.1.A.1 Build, draw and combine 2D and 3D shapes and identify their attributes.
• CC.2.3.1.A.2 Split circles and rectangles into halves and fourths; more shares means smaller shares.

2.4 Measurement, Data, and Probability

• CC.2.4.1.A.1 Order objects by length, compare lengths indirectly and measure in whole units.
• CC.2.4.1.A.2 Tell and write time to the hour and half hour.
• CC.2.4.1.A.4 Organize, show and interpret data in up to three categories.