Florida SS.8.FL.3.5

Social Studies8th GradeSaving

The Standard

Identify principal as the initial amount of money upon which interest is paid.

Florida Next Generation Sunshine State Standards for Social Studies

Teacher's field guide

What Students Need to Do: Students identify the starting amount in a savings account before any interest is added. They distinguish that amount from interest earned and the current balance.
What Mastery Looks Like: Given a savings scenario, students correctly label the principal, interest, and ending balance. They can explain that later interest calculations use the principal or updated balance.
Common Misconceptions: Students may call the ending balance the principal. They may also confuse principal with the interest earned or the interest rate.
How to Assess It: Give this exit ticket: “Lena deposits $300 and earns $12 in interest. Identify the principal, interest, and ending balance.”

Lesson moves

Give pairs play money to model a $200 deposit, add $10 interest, then label the principal and ending balance.
Ask students to explain why the principal in a $500 account is not $525 after $25 of interest is added.
Run a card sort matching savings scenarios with cards labeled principal, interest, interest rate, and ending balance.
Show a sample savings statement and have students circle the original deposit, underline interest earned, and box the current balance.

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