Action steps
1. Count to 120, starting at any number less than 120. In this range, read and write numerals and represent a number of objects with a written numeral.
2. Understand that the two digits of a two-digit number represent amounts of tens and ones.
3. Compare two two-digit numbers based on meanings of the tens and ones digits, recording the results of comparisons with the symbols >, =, and <.
4. Add a two-digit number and a one-digit number, within 100.
5. Understand that in adding two-digit numbers, it requires adding tens and tens, ones and ones.
6. Given a two-digit number, mentally find 10 more or 10 less than the number, with counting; explain the reasoning used.
7. Subtract multiples of 10 in the range 10-90 from multiples of 10 in the range 10-90 (positive or zero differences).
Action steps
1. Use addition and subtraction within 10 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing.
2. Solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20, for example, by using: objects to represent the problem, drawings to represent the problem, equations with a symbol for the unknown number to represent the problem.
3. Apply properties of operations as strategies to add and subtract. For example, if 8 + 3 = 11 is known, then 3 + 8 = 11 is also known.
4. Understand subtraction as an unknown-addend problem. For example, subtract 10 – 8 by finding the number that makes 10 when added to 8.
5. Relate counting to addition and subtraction (for example, by counting on 2 to add 2).
6. Add and subtract within 20, developing ease and accuracy for addition and subtraction within 10.
7. Understand the meaning of the equal sign, and determine if equations involving addition and subtraction are true or false.
8. Determine the unknown whole number in an addition or subtraction equation relating to three whole numbers. For example, determine the unknown number that makes the following equation true: 8 + ? = 11.
Action steps
1. Distinguish between defining attributes (for example, triangles are closed and three-sided) versus non-defining attributes (for example, color, orientation, overall size).
2. Compose two-dimensional (rectangles, squares, trapezoids, triangles, half-circles, and quarter-circles) or three-dimensional shapes (cubes, right rectangular prisms, right circular cones, and right circular cylinders) to create a composite shape.
3. Partition circles and rectangles into two and four equal shares.
4. Describe the shares using the words halves, fourths, and quarters.
Action steps
1. Order and compare objects by length.
2. Express length and understand what the length of an object represents. Limit to contexts where the object being measured is spanned by a whole number of length units with no gaps or overlaps.
3. Tell and write time in hours and half-hours using analog and digital clocks.
4. Organize and represent data with up to three categories and interpret data with up to three categories.
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