First Grade mathematics is about (1) developing understanding of addition, subtraction, and strategies for addition and subtraction within 20; (2) developing understanding of whole number relationships and place value, including grouping in tens and ones; (3) developing understanding of linear measurement and measuring lengths as iterating length units; and (4) reasoning about attributes of, and composing and decomposing geometric shapes.

Topics include:
• Represent and solve problems involving addition and subtraction
• Understand and apply properties of operations and the relationship between addition and subtraction
• Add and subtract within 40
• Count to 120 and extend a counting sequence from any number less than 120
• Understand place value
• Order and compare objects by lengths
• Measure and express the length of an object as a whole number of length units
• Tell and write time in hours and half hours using analogue and digital clocks
• Organize, represent, and interpret data
• Reason with shapes and their attributes