Category: Grade 1 Math

Operations and Algebraic Thinking: In this unit, students will progress towards fluency with addition and subtraction of numbers to 10 (1.OA.6) using strategies to advance them from counting all to counting on, which leads many students then to decomposing and composing addends and total amounts. They will represent addition and subtraction with objects, fingers, mental images, drawings, sounds (e.g., claps), and act out situations, verbal explanations, expressions, or equations. They will understand the relationship between addition and subtraction and the meaning of the equal sign. Applying all of this knowledge and skill, students will use problem solving structures to solve addition and subtraction word problems within 10 (using both two and three whole numbers for addition) involving all situations using objects, drawings, and equations.

This unit serves as a bridge from problem solving within 10 to work within 100 as students begin to solve addition and subtraction problems involving teen numbers. In unit 1, students were encouraged to move beyond the beginning strategy of counting all to the more efficient counting on. Now, they go beyond that level to decomposition and composition strategies, informally called make ten or take from ten. Students will work on the concept of addition and subtraction within 20 and focus on building fluency within 10. Mastery of facts is not expected at this point in the year. They will develop an understanding of ten as a unit to analyze teens as ten and some ones and use modalities to build individual numbers with tens/ones while counting. Students will compare two two-digit numbers using symbols (<,>,=).

In this unit students will learn to use their number sense to compare (using symbols  >, =, and <.) and order values of two two-digit numbers. They will model, write and solve addition and subtraction equations within 100 including composing new tens when necessary when adding. The students will apply mental math strategies when adding and subtracting multiples of ten.

In this unit students will learn to tell time to the hour and half-hour using analog and digital clocks. The students will learn to identify coins and their values and to use the cent (¢) sign. The students will count combinations of dimes and pennies within 100 cents. The students also learn to measure and compare lengths using standards and nonstandard measuring tools. The students will organize, represent and interpret data, including asking and answering questions and comparing amounts across categories.

In this unit students will learn to tell time to the hour and half-hour using analog and digital clocks. The students will learn to identify coins and their values and to use the cent (¢) sign. The students will count combinations of dimes and pennies within 100 cents. The students also learn to measure and compare lengths using standards and nonstandard measuring tools. The students will organize, represent and interpret data, including asking and answering questions and comparing amounts across categories.