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# Explore the Core: 1st Grade

ISBN 9781930820241

GP-224

**Pages: 80**-
This series provides the tools necessary to capture the wonder and fun of mathematics while helping teachers and parents instruct the Common Core Mathematics Standards in a manageable way. Each book focuses and connects to the Standards for Mathematical Content and Standards for Mathematical Practice, including: making sense of problems and persevere in solving them, modeling with mathematics, and using appropriate tools strategically. Featuring: a chart to monitor progress toward learning goal success; pre & post assessments for every Common Cores Standard domain; a problem set for every Common Core Standard; authentic challenge projects with real-world and technology integration; a detailed answer key.

**Table of Contents**

Dear ParentProgress-Monitoring ChartTable of ContentsPre/Post Assessments and Problem SetsDomain 1: Operations & Algebraic ThinkingPre/Post AssessmentDomain 1: Represent and solve problems using addition and subtraction1.OA.A.1. Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions.

1.OA.A.2. Solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.Understand and apply properties of operations and the relationship between addition and subtraction1.OA.B.3. Apply properties of operations as strategies to add and subtract.

1.OA.B.4. Understand subtraction as an unknown-addend problem.Add and subtract within 201.OA.C.5. Relate counting to addition and subtraction.

1.OA.C.5. Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten; decomposing a number leading to a ten; using the relationship between addition and subtraction; and creating equivalent but easier or known sums.Work with addition and subtraction equations1.OA.D.7 Understand the meaning of the equal sign, and determine if equations involving addition and subtraction are true or false.

1.OA.D.7 Determine the unknown whole number in an addition or subtraction equation relating three whole numbers.Domain 2: Number & Operations in Base 10

Pre/Post Assessment

Extend the Counting Sequence1.NBT.A.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.Understand place value1.NBT.2. Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases: 10 can be thought of as a bundle of ten ones — called a “ten.” The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones. The numbers 10, 20, 30, 40, 50, 60, 70, 80, 90 refer to one, two, three, four, five, six, seven, eight, or nine tens (and 0 ones).

1.NBT.B.3. Compare two two-digit numbers based on meanings of the tens and ones digits, recording the results of comparisons with the symbols >, =, and <.Use place value understanding and properties of operations to add and subtract1.NBT.C.4. Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of 10, using concrete models or drawings and strategies based on place value, properties of operations, and/ or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used. Understand that in adding two-digit numbers, one adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten.

1.NBT.C.5. Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.

1.NBT.C.6. Subtract multiples of 10 in the range 10-90 from multiples of 10 in the range 10-90 (positive or zero differences), using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used.Domain 3: Measurement & Data

Pre/Post Assessment

Measure lengths indirectly and by iterating length units1.MD.A.1. Order three objects by length; compare the lengths of two objects indirectly by using a third object.

1.MD.A.2. Express the length of an object as a whole number of length units, by laying multiple copies of a shorter object (the length unit) end to end; understand that the length measurement of an objectis the number of same-size length units that span it with no gaps or overlaps. Limit to contexts where the object being measured is spanned by a whole number of length units with no gaps or overlaps.Tell and write time1.MD.B.3. Tell and write time in hours and half-hours using analog and digital clocks.Represent and interpret data1.MD.B.4. Organize, represent, and interpret data with up to three categories; ask and answer questions about the total number of data points, how many in each category, and how many more or less are in one category than in another.Domain 4: Geometry

Pre/Post Assessment

Reason with shapes and their attributes1.G.A.1. Distinguish between defining attributes versus non-defining attributes; build and draw shapes to possess defining attributes,

1.G.A.2. Compose two-dimensional shapes (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, and compose new shapes from the composite shape.

1.G.A.3. Partition circles and rectangles into two and four equal shares, describe the shares using the words*halves, fourths,*and*quarters*, and use the phrases*half of, fourth of,*and*quarter of.*Describe the whole as two of, or four of the shares. Understand for these examples that decomposing into more equal shares creates smaller shares.Authentic Challenge Projects

Description

Project #1: "Lunch Count"

Project #2: "Art Show"

Project #3: "How Many Pencils Long"

Answer Key