What Math Should a 1st Grader Know? Complete Parent Guide

Counting & Number Sense

• Count forward and backward from any number up to 120
• Read and write numbers to 120
• Compare two-digit numbers using >, <, and = symbols
• Understand that 10 ones make a ten (place value foundation)

Addition & Subtraction

• Add and subtract within 20 with fluency
• Solve word problems involving adding to, taking from, and comparing
• Understand the relationship between addition and subtraction (fact families)
• Use strategies like counting on, making ten, and doubles

Place Value

• Understand tens and ones (e.g., 34 = 3 tens and 4 ones)
• Add within 100 using place value understanding (e.g., 40 + 30 = 70)
• Mentally find 10 more or 10 less than any two-digit number

Measurement & Time

• Order three objects by length and compare two lengths indirectly
• Tell and write time to the hour and half-hour on analog and digital clocks
• Measure length using non-standard units (paper clips, cubes)

Geometry & Fractions

• Identify and describe shapes: squares, circles, triangles, rectangles, trapezoids
• Distinguish between defining attributes (triangles have 3 sides) and non-defining (color, size)
• Partition circles and rectangles into two and four equal shares (halves and quarters)
• Understand that equal shares of identical wholes may look different

Make math part of everyday life

Count stairs as you climb, sort laundry by color (how many red shirts?), split snacks equally. First graders learn best when math feels like play, not worksheets.

Play dice and card games

Games like War, Go Fish (matching numbers), and rolling two dice and adding them build fluency without drilling. Aim for 10-15 minutes of math play daily.

Use a number line at home

Tape a number line (0-30) on the kitchen table. When your child needs to add 8 + 5, let them "hop" along it. This builds the mental number line they need for second grade.

Read the clock together

Point out times during routines: "It's 7 o'clock — time for breakfast!" Use analog clocks so they see the hour hand move.

Celebrate mistakes

When your child gets something wrong, say "Interesting — tell me how you thought about it." Building math confidence at this age matters more than getting every answer right.