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5.NBT.3 – Read, write, and compare decimals to thousandths.
5.NBT.3.a – Read and write decimals to thousandths using base-ten numerals, number names, and expanded form, e.g., 347.392 = 3 × 100 + 4 × 10 + 7 × 1 + 3 × (1/10) + 9 × (1/100) + 2 × (1/1000).
Samples: Decimal Numbers - Expanded Form. Introduction to decimals: Activity 1. Compare and order decimals: Activity 1.
You can go to an overview of all the curricula here.
7.NA.2 – Apply additive strategies to decimals
Samples: Introduction to decimals: Activity 1. Equivalence between fractions and decimals: Activity 1.