Common Core: 1st Grade Math

This subject covers foundational math concepts for first graders, including addition, subtraction, and basic number sense.

Number Sense and CountingAddition BasicsSubtraction Basics
Understanding Place ValueWord Problems with Addition and SubtractionComparing and Ordering Numbers
Using Math at the Grocery StoreMath with MoneySharing and Dividing Fairly
Using Objects and DrawingsCounting On and Counting Back
Number Sense and Cou...Addition BasicsSubtraction BasicsUnderstanding Place ...Word Problems with A...Comparing and Orderi...Using Math at the Gr...Math with MoneySharing and Dividing...Using Objects and Dr...Counting On and Coun...
Advanced Topics

Understanding Place Value

What Is Place Value?

Place value tells us what a number really means by showing the value of each digit.

Tens and Ones

In the number 12, the '1' is in the tens place and means ten. The '2' is in the ones place and means two.

\(12 = (1 \times 10) + (2 \times 1) = 10 + 2\)

Why Place Value Matters

Place value helps us read and write numbers correctly and understand how numbers grow.

Using Place Value

We can use blocks or draw groups to show tens and ones.

Key Formula

\[12 = (1 \times 10) + (2 \times 1)\]

Examples

  • The number 24 means 2 tens and 4 ones.

  • In 37, the '3' means 30 and the '7' means 7.

In a Nutshell

Place value helps us see what each digit in a number stands for.

Key Terms

Place Value
The value a digit has because of its place in a number.
Tens
Groups of ten.
Ones
Single units.
Next
Word Problems with Addition and Subtraction