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Children typically start learning decimals in elementary school, around 3rd or 4th grade (ages 8–10), although the exact timing can vary. Here’s a general breakdown of how decimal learning progresses:

1. 3rd Grade (Ages 8–9)
Introduction to Place Value: Students begin understanding the concept of place value, extending from whole numbers to tenths.
Simple Decimal Concepts: They might encounter basic decimals (e.g., 0.5 as half of 1) in contexts like money or measurements.

2. 4th Grade (Ages 9–10)
Addition and Subtraction: Adding and subtracting decimals, often using money as a practical example.
Place Value Expansion: They explore tenths, hundredths, and thousandths, connecting decimals to fractions.

3. 5th Grade and Beyond (Ages 10–11 and up)
Multiplication and Division: Multiplying and dividing decimals, which involves further understanding of place value.
Applications in Measurement and Money: They practice using decimals in real-life situations, like calculating change or measuring with rulers.
Converting Fractions to Decimals: By now, students learn how fractions convert into decimals, helping them understand equivalence.

Why Start Around This Age?
By this age, students usually have a strong foundation in basic arithmetic (addition, subtraction, multiplication, division), making it easier to transition to more abstract decimal concepts.