Grade 3 Chapter 2: Mental Math and Estimation
2.1 Mental Addition
- Add 2-Digit Numbers Mentally with Compensation
2.2 Mental Subtraction
- Subtract 2-Digit Numbers Mentally with Compensation
2.2 Mental Subtraction
- Subtract 3-Digit Numbers Mentally with Compensation
2.2 Mental Subtraction
- Subtract 3-Digit Numbers Mentally Using a Number Line
2.3 More Mental Addition
- Add 3-Digit Numbers Mentally Using a Number Line
2.4 Rounding Numbers to Estimate
- Rounding and Place Value