Grade 1 Math

In Grade 1, instruction should concentrate on four key areas: (1) building an understanding of addition and subtraction, as well as strategies for solving problems within 20; (2) developing a grasp of whole number relationships and place value, with a focus on grouping tens and ones; (3) learning about linear measurement and the process of measuring lengths by repeating units; and (4) reasoning about the characteristics of geometric shapes, including composing and decomposing them.

In This Free Course, You Will Learn How To

• Operations and Algebraic Thinking
• Number and Operations in Base Ten

• Measurement and Data
• Geometry

• 1. Develop strategies for adding and subtracting whole numbers by building on prior experience with small numbers. Use physical models (like connecting cubes) to represent add-to, take-from, put-together, take-apart, and compare scenarios. Connect counting to addition and subtraction (e.g., adding two = counting on two). Apply properties of addition (e.g., “make ten”) to solve problems within 20 and explore the relationship between addition and subtraction through various strategies.
  2. Add within 100 and subtract multiples of 10 using efficient, accurate, and general methods. Compare numbers up to 100 to understand and solve size-related problems. Think of numbers from 10–100 in terms of tens and ones (e.g., 17 = 10 + 7). Build number sense through activities that reinforce counting order and relative magnitudes.

3. Understand measurement by exploring how equal-sized units build lengths and using indirect measurement through the transitivity principle.
4. Compose and decompose plane and solid shapes to explore part-whole relationships and shape properties. Combine shapes (e.g., two triangles = one quadrilateral), view them from different angles, describe attributes, and compare to understand concepts like symmetry and congruence.