Skills available for Colorado first-grade math standards
Standards are in bold, followed by a list of the IXL math skills that are aligned to that standards. Students can practice these skills online at www.ixl.com.
1.1.1 The whole number system describes place value relationships within and beyond 100 and forms the foundation for efficient algorithms
1.1.1.a Count to 120.
1.1.1.a.i Count starting at any number less than 120.
Counting review - up to 10 (1-A.1)
Counting review - up to 20 (1-A.3)
Counting tens and ones - up to 20 (1-A.4)
Counting - up to 30 (1-A.5)
Counting - up to 100 (1-A.7)
Counting by twos, fives, and tens with pictures (1-A.9)
Number lines (1-A.12)
Counting on the hundred chart (1-A.13)
1.1.1.a.ii Within 120, read and write numerals and represent a number of objects with a written numeral.
Counting review - up to 10 (1-A.1)
Counting review - up to 20 (1-A.3)
Counting tens and ones - up to 20 (1-A.4)
Counting - up to 30 (1-A.5)
Counting - up to 100 (1-A.7)
Counting tens and ones - up to 99 (1-A.8)
Counting by twos, fives, and tens with pictures (1-A.9)
Writing numbers in words (1-A.22)
Roman numerals I, V, X (1-A.23)
1.1.1.b Represent and use the digits of a two-digit number.
1.1.1.b.i Represent the digits of a two-digit number as tens and ones.
Counting tens and ones - up to 99 (1-A.8)
Counting by twos, fives, and tens (1-A.10)
Hundred chart (1-A.14)
Place value models up to 20 (1-M.1)
Write numbers as tens and ones up to 20 (1-M.2)
Place value models up to 100 (1-M.3)
Convert between tens and ones (1-M.4)
Write numbers as tens and ones (1-M.5)
1.1.1.b.ii Compare two two-digit numbers based on meanings of the tens and ones digits, recording the results of comparisons with the symbols >, =, and <.
Comparing numbers up to 100 (1-K.3)
Put numbers in order (1-T.3)
1.1.1.b.iii Compare two sets of objects, including pennies, up to at least 25 using language such as "three more or three fewer"
1.1.1.c Use place value and properties of operations to add and subtract.
1.1.1.c.i Add within 100, including adding a two-digit number and a one-digit number and adding a two-digit number and a multiple of ten, using concrete models or drawings, and/or the relationship between addition and subtraction.
Add a one-digit number to a two-digit number - without regrouping (1-D.16)
Add a one-digit number to a two-digit number - with regrouping (1-D.19)
Add two multiples of ten (1-E.9)
Add a multiple of ten (1-E.10)
Ten more or less (1-J.8)
1.1.1.c.ii Identify coins and find the value of a collection of two coins.
Names and values of common coins (1-Q.1)
Names and values of all coins (1-Q.2)
1.1.1.c.iii Mentally find 10 more or 10 less than any two-digit number, without counting; explain the reasoning used.
Ten more or less (1-J.8)
1.1.1.c.iv 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.
Subtract multiples of 10 (1-I.3)
Add and subtract tens (1-J.9)
1.1.1.c.v Relate addition and subtraction strategies to a written method and explain the reasoning used.
Related addition facts (1-D.14)
Related subtraction facts (1-H.13)
Fact families (1-J.3)
1.1.2 Number relationships can be used to solve addition and subtraction problems
1.1.2.a Represent and solve problems involving addition and subtraction.
1.1.2.a.i Use addition and subtraction within 20 to solve word problems.
Addition word problems - sums up to 10 (1-D.5)
Addition sentences for word problems - sums up to 10 (1-D.6)
Addition word problems - sums up to 18 (1-D.9)
Subtraction word problems - numbers up to 10 (1-H.6)
Subtraction sentences for word problems - numbers up to 10 (1-H.7)
Subtraction word problems - numbers up to 18 (1-H.10)
Addition and subtraction word problems (1-J.6)
1.1.2.a.ii Solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20.
Add three numbers - word problems (1-E.12)
1.1.2.b Apply properties of operations and the relationship between addition and subtraction.
1.1.2.b.i Apply properties of operations as strategies to add and subtract.
Related addition facts (1-D.14)
Add three numbers (1-E.11)
Add three numbers - word problems (1-E.12)
Related subtraction facts (1-H.13)
Fact families (1-J.3)
1.1.2.b.ii Relate subtraction to unknown-addend problem.
Complete the addition sentence - sums up to 10 (1-D.3)
1.1.2.c Add and subtract within 20.
1.1.2.c.i Relate counting to addition and subtraction.
Count to fill a ten frame (1-A.2)
Counting forward and backward (1-A.11)
Skip-counting patterns - with tables (1-A.19)
Sequences - count up and down by 1, 2, 3, 5, and 10 (1-A.20)
Add doubles - with models (1-E.1)
1.1.2.c.ii Add and subtract within 20 using multiple strategies.
Addition sentences using number lines - sums up to 10 (1-B.3)
Adding zero (1-B.4)
Adding 1 (1-C.1)
Adding 2 (1-C.2)
Adding 3 (1-C.3)
Adding 4 (1-C.4)
Adding 5 (1-C.5)
Adding 6 (1-C.6)
Adding 7 (1-C.7)
Adding 8 (1-C.8)
Adding 9 (1-C.9)
Adding 0 (1-C.10)
Addition facts - sums up to 10 (1-D.1)
Make a number using addition - sums up to 10 (1-D.2)
Ways to make a number - addition sentences (1-D.4)
Addition sentences using number lines - sums up to 18 (1-D.7)
Addition facts - sums up to 18 (1-D.8)
Addition facts - sums up to 20 (1-D.11)
Add doubles (1-E.2)
Add using doubles plus one (1-E.4)
Add using doubles minus one (1-E.5)
Subtraction sentences using number lines - numbers up to 10 (1-F.3)
Subtract zero and all (1-F.4)
Subtracting 1 (1-G.1)
Subtracting 2 (1-G.2)
Subtracting 3 (1-G.3)
Subtracting 4 (1-G.4)
Subtracting 5 (1-G.5)
Subtracting 6 (1-G.6)
Subtracting 7 (1-G.7)
Subtracting 8 (1-G.8)
Subtracting 9 (1-G.9)
Subtracting 0 (1-G.10)
Subtraction facts - numbers up to 10 (1-H.1)
Make a number using subtraction - numbers up to 10 (1-H.2)
Ways to make a number - subtraction sentences (1-H.3)
Ways to subtract from a number - subtraction sentences (1-H.4)
Subtraction sentences using number lines - numbers up to 18 (1-H.8)
Subtraction facts - numbers up to 18 (1-H.9)
Subtract one-digit numbers from two-digit numbers (1-H.15)
Subtract doubles (1-I.2)
Addition and subtraction - ways to make a number (1-J.1)
Addition and subtraction facts - numbers up to 10 (1-J.4)
Addition and subtraction facts - numbers up to 18 (1-J.5)
1.1.2.c.iii Demonstrate fluency for addition and subtraction within 10.
Adding zero (1-B.4)
Addition facts - sums up to 10 (1-D.1)
Make a number using addition - sums up to 10 (1-D.2)
Ways to make a number - addition sentences (1-D.4)
Subtract zero and all (1-F.4)
Subtraction facts - numbers up to 10 (1-H.1)
Make a number using subtraction - numbers up to 10 (1-H.2)
Ways to make a number - subtraction sentences (1-H.3)
Ways to subtract from a number - subtraction sentences (1-H.4)
Subtract doubles (1-I.2)
Addition and subtraction - ways to make a number (1-J.1)
Addition and subtraction facts - numbers up to 10 (1-J.4)
1.1.2.d Use addition and subtraction equations to show number relationships.
1.1.2.d.i Use the equal sign to demonstrate equality in number relationships.
Addition sentences: true or false? (1-D.15)
Subtraction sentences: true or false? (1-H.14)
Which sign makes the number sentence true? (1-J.2)
Addition and subtraction sentences: true or false? (1-J.7)
1.1.2.d.ii Determine the unknown whole number in an addition or subtraction equation relating three whole numbers.
Complete the addition sentence - sums up to 10 (1-D.3)
Add doubles - complete the sentence (1-E.3)
Complete the subtraction sentence (1-H.5)
1.3 Data Analysis, Statistics, and Probability
1.3.1 Visual displays of information can used to answer questions
1.3.1.a Represent and interpret data.
Record data with tally charts, picture graphs, tables (1-O.1)
Interpret data in tally charts, picture graphs, tables (1-O.2)
Interpret bar graphs (1-O.3)
Which bar graph is correct? (1-O.4)
1.3.1.a.i Organize, represent, and interpret data with up to three categories.
Record data with tally charts, picture graphs, tables (1-O.1)
Interpret data in tally charts, picture graphs, tables (1-O.2)
Interpret bar graphs (1-O.3)
Which bar graph is correct? (1-O.4)
1.3.1.a.ii 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.
Interpret data in tally charts, picture graphs, tables (1-O.2)
Interpret bar graphs (1-O.3)
1.4 Shape, Dimension, and Geometric Relationships
1.4.1 Shapes can be described by defining attributes and created by composing and decomposing
1.4.1.a Distinguish between defining attributes versus non-defining attributes.
Name the two-dimensional shape (1-V.1)
Select two-dimensional shapes (1-V.2)
Count sides and vertices (1-V.3)
Compare sides and vertices (1-V.4)
Open and closed shapes (1-V.5)
Count vertices, edges, and faces (1-W.5)
Compare vertices, edges, and faces (1-W.6)
1.4.1.b Build and draw shapes to possess defining attributes.
1.4.1.c Compose two-dimensional shapes or three-dimensional shapes to create a composite shape, and compose new shapes from the composite shape.
1.4.1.d Partition circles and rectangles into two and four equal shares.
1.4.1.d.i Describe shares using the words halves, fourths, and quarters, and use the phrases half of, fourth of, and quarter of.
Equal parts (1-X.1)
Halves, thirds, and fourths (1-X.2)
Simple fractions: what fraction does the shape show? (1-X.3)
Simple fractions: which shape matches the fraction? (1-X.4)
1.4.1.d.ii Describe the whole as two of, or four of the equal shares.
Halves, thirds, and fourths (1-X.2)
Simple fractions: what fraction does the shape show? (1-X.3)
Simple fractions: which shape matches the fraction? (1-X.4)
Fraction models equivalent to whole numbers (1-X.8)
Fractions equivalent to whole numbers (1-X.9)
1.4.2 Measurement is used to compare and order objects and events
1.4.2.a Measure lengths indirectly and by iterating length units.
1.4.2.a.i Order three objects by length; compare the lengths of two objects indirectly by using a third object.
Customary units of length: word problems (1-P.6)
Metric units of length: word problems (1-P.11)
Put numbers in order (1-T.3)
1.4.2.a.ii Express the length of an object as a whole number of length units.
Measure using objects (1-P.3)
Measure using an inch ruler (1-P.4)
Measure using a centimeter ruler (1-P.9)
1.4.2.b Tell and write time.
1.4.2.b.i Tell and write time in hours and half-hours using analog and digital clocks.