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# 1st Grade Skills in Math

The 1st Grade Skills below are based on the Common Core Standards For Mathematics. You can find out more about the Common Core Standards here.

You will also find a listing of related math resources (worksheets, charts, etc) here.

Note: Math standards and curricula can vary by location or school. Check with your child’s school to determine what 1st grade math skills are expected in your location.

## Operations & Algebraic Thinking

Solving word problems with adding and subtracting with numbers up to 20.

The listing of worksheets and other math resources below are related to the following standard extracted from the Common Core Standards For Mathematics:

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, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.

### Slightly Different

##### Word problems
Solving word problems that require adding three numbers with a maximum total of 20.

The listing of worksheets and other math resources below are related to the following standard extracted from the Common Core Standards For Mathematics:

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.

### Game

Understanding and applying the commutative (e.g. 7 + 4 = 11 then 4 + 7 = 11) and the associative (e.g. 3 + 5 + 4 = 12 then 8 + 4 = 12) properties when adding and subtracting.

The listing of worksheets and other math resources below are related to the following standard extracted from the Common Core Standards For Mathematics:

Apply properties of operations as strategies to add and subtract.2 Examples: If 8 + 3 = 11 is known, then 3 + 8 = 11 is also known. (Commutative property of addition.) To add 2 + 6 + 4, the second two numbers can be added to make a ten, so 2 + 6 + 4 = 2 + 10 = 12. (Associative property of addition.).

### Fact Families

##### Slightly Different
Recognizing the relationship between addition and subtraction to help solve subtraction problems. e.g. To solve 10 – 3, find that number that when added to 3 gives 10.

The listing of worksheets and other math resources below are related to the following standard extracted from the Common Core Standards For Mathematics:

Understand subtraction as an unknown-addend problem. For example, subtract 10 – 8 by finding the number that makes 10 when added to 8. Add and subtract within 20.

### Game

Identifying the relationship between skip counting and adding and subtracting.

The listing of worksheets and other math resources below are related to the following standard extracted from the Common Core Standards For Mathematics:

Relate counting to addition and subtraction (e.g., by counting on 2 to add 2).

### Number line

Adding and subtracting with numbers to 20 using strategies including making ten. (e.g. 9 + 6 = 9 + 1 + 5 = 15 and 15 – 7 = 15 – 5 – 2 = 10 – 2 = 8) and using fact families (e.g. 8 + 3 = 11 therefore 11 – 3 = 8).

The listing of worksheets and other math resources below are related to the following standard extracted from the Common Core Standards For Mathematics:

Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 – 4 = 13 – 3 – 1 = 10 – 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 – 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).

### Worksheet Generator

Recognizing the meaning of the equal sign and identifying its correct use. e.g. 5 = 2 + 3 is true but 3 + 2 = 4 + 3 is not.

The listing of worksheets and other math resources below are related to the following standard extracted from the Common Core Standards For Mathematics:

Understand the meaning of the equal sign, and determine if equations involving addition and subtraction are true or false. For example, which of the following equations are true and which are false? 6 = 6, 7 = 8 – 1, 5 + 2 = 2 + 5, 4 + 1 = 5 + 2.

### To 20

Finding unknowns in adding and subtracting equations.
e.g. 5 + __ = 9 or 6 = __ – 4
.

The listing of worksheets and other math resources below are related to the following standard extracted from the Common Core Standards For Mathematics:

Determine the unknown whole number in an addition or subtraction equation relating three whole numbers. For example, determine the unknown number that makes the equation true in each of the equations 8 + ? = 11, 5 = _ – 3, 6 + 6 = _..

## Number & Operations in Base Ten

Counting up to 120 from different starting points and reading and writing the numerals.

The listing of worksheets and other math resources below are related to the following standard extracted from the Common Core Standards For Mathematics:

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.

### Worksheet Generator

Recognizing that, for 2-digit numbers, the digits represent the amount of ones and the amount of tens.

The listing of worksheets and other math resources below are related to the following standard extracted from the Common Core Standards For Mathematics:

Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases:
1. 10 can be thought of as a bundle of ten ones – called a “ten.”
2. The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones.
3. 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).

### Worksheet Generator

Writing numbers up to 20.

The listing of worksheets and other math resources below are related to the following standard extracted from the Common Core Standards For Mathematics:

Compare two two-digit numbers based on meanings of the tens and ones digits, recording the results of comparisons with the symbols >, =, and <..

#### Example/Guidance

Understanding place value when adding or subtracting 2-digit and 1-digit numbers and when adding multiples of 10.

The listing of worksheets and other math resources below are related to the following standard extracted from the Common Core Standards For Mathematics:

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.

### Worksheet

Finding 10 more or 10 less than any 2-digit number without writing or counting.

The listing of worksheets and other math resources below are related to the following standard extracted from the Common Core Standards For Mathematics:

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

#### Puzzle

Subtracting with multiples of ten (maximum 90). e.g. 80 – 50 = 20.

## Measurement & Data

Comparing and ordering 3 objects by length.
Measuring the length of an object using a shorter length as a unit of length. e.g. the pencil is 4 erasers long.
Telling and writing time on the hour and on the half hour.

The listing of worksheets and other math resources below are related to the following standard extracted from the Common Core Standards For Mathematics:

Tell and write time in hours and half-hours using analog and digital clocks.

### Worksheet Generator

Categorize data into as many as three categories and make comparisons of that within these categories.

## Geometry

Understanding the difference between what defines a shape and what doesn’t. e.g. a triangle having 3 sides is a defining attribute while the size or color is not a defining attribute.
Creating composite shapes by combining a variety of different shapes together (both 2 and 3-dimensional).
Dividing rectangles and circles into halves and quarters and using these terms to describe these equal shares.

The listing of worksheets and other math resources below are related to the following standard extracted from the Common Core Standards For Mathematics:

Partition circles and rectangles into two and four equal shares, describe the shares using the words halvesfourths, and quarters, and use the phrases half offourth 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.

### Activity

Browse for skills and worksheets at other grade levels by clicking in the table below.