Ep 109: Multiplying By One Tenth

Being able to scale comfortably is important for both whole and decimal numbers. And just as there are more sophisticated ways to handle scaling with whole numbers, we can also be more sophisticated scaling decimals! In this episode Pam and Kim describe how we can help students become comfortable with decimal multiplication using their understanding of whole number multiplication and then scaling.
Talking Points:

• Reflecting on the more sophisticated strategy from Ep 106
• Applying knowledge of whole number multiplication to decimals
• It's more about reasoning than shifting the decimal
• Reasoning in small steps builds understanding vs. just counting the decimals
• Reasonableness comes from keeping kids in reasoning land
• Language to focus on and language to avoid