MentalMath offers hundreds of first grade math skills and games to explore and learn! Not sure where to start? Go to your personalized Recommendations wall to find a skill that looks interesting, or select a skill plan that aligns to your textbook, state standards, or standardized test.

- 3.1 Addition
- 3.2 Single Digit Number Addition
- 3.3 Adding Objects
- 3.4 Doubling Numbers
- 3.5 Using Near Doubles
- 3.6 Order in Addition

- 11.1 Add by Tens
- 11.2 Add by Ones
- 11.3 Add by Tens and by Ones
- 11.4 How to Use a Hundred Chart
- 11.5 Add Numbers Ending in Zero
- 11.6 Looking for Pattern in Problem Solving

- 13.1 Using Regrouping in Addition
- 13.2 Models for One-Digit Number Addition
- 13.3 Add One-Digit and Two-Digit Numbers
- 13.4 Modeling Adding Two-Digit Numbers
- 13.5 Adding Two-Digit Numbers
- 13.6 Complete Addition Sentences
- 13.7 Add Vertically and Horizontally
- 13.8 Three Number Additions
- 13.9 Use Pictures and Write Number Sentences in Problem Solving

- 18.1 Attributes of Measurement
- 18.2 Measure Length
- 18.3 Measure Length: Use Non-Standard Unit
- 18.4 Use Inches, Feet, and Yards to Measure Length
- 18.5 Use Centimeters and Meters in Measure Length
- 18.6 Compare and Convert Meter, Centimeter, and Millimeter
- 18.7 Perimeter
- 18.8 Area
- 18.9 Using Objects in Problem Solving

- 19.1 Measuring Capacity
- 19.2 Understanding Cups, Pints, and Quarts
- 19.3 Compare and Convert Cups, Pints, and Quarts
- 19.4 Understanding Liter and Milliliter
- 19.5 Compare and Convert Liter and Milliliter
- 19.6 Measuring Weight
- 19.7 Understanding Pounds and Ounces
- 19.8 Compare and Convert Pounds and Ounces
- 19.9 Understanding Grams and Kilograms
- 19.10 Compare and Convert Grams and Kilograms
- 19.11 Using Objects in Problem Solving

- 21.1 Estimate Elapsed Time
- 21.2 Read the Calendar
- 21.3 Read Temperature in Fahrenheit and Celsius
- 21.4 Relate Time Units
- 21.5 Problem Solving

- 25.1 Using Mental Math
- 25.2 How to Estimate Sums
- 25.3 Using Models for Three-Digit Number Addition
- 25.4 Exploring Adding Three-Digit Numbers
- 25.5 Finding Missing Parts Using Mental Math
- 25.6 Estimate the Differences
- 25.7 Identifying Models for Subtraction
- 25.8 Subtraction Using Three-Digit Numbers
- 25.9 Compare Addition and Subtraction Sentences
- 25.10 Balance Addition and Subtraction Sentences
- 25.11 Making Graphs in Solving Problems

- 26.1 Understanding Multiplication as Repeated Addition
- 26.2 Multiplication Facts of 0 to 2
- 26.3 Multiplication Facts of 3 to 5
- 26.4 How to Build Arrays
- 26.5 Stories of Multiplication
- 26.6 Vertical Form of Multiplication
- 26.7 Exploring Multiplication in any Order
- 26.8 Multiplication by Using Number Line
- 26.9 Draw Pictures and Write Multiplication Sentences

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