Percentage

Practice 3 items →

Percent is a ratio with denominator 100. Students convert among fraction, decimal, and percent, find p% of a quantity, and work discount, tax, markup, and simple-interest stories — knowing which amount the tax applies to.

Specification · for a parent or teacher

Part no.: percent-financial-intro
Course: Advanced Math 5 · Unit 15
Realm: Applied
Difficulty: 3 of 4 — Grade 6–7 core. Multi-step, first symbolic work.
Qty: 3 items

Part no. is the node's id; the realm is the kind of math; qty is how many practice items it carries.

Students can

convert fraction ↔ decimal ↔ percent; find $p\%$ of a quantity; discounts, tax, markup, simple interest as one-step or two-step stories.

Ready when

a $45 item, 20% off, then 8% tax — they know which amount the tax applies to and finish.

Formulas

Percent

p\% = \frac{p}{100}

Watch for

5% of 80 as 5; “increase by 20%” as +20; tax computed on the discounted price vs original, mixed up.

Before · requires

Ratioratio-tape-diagrams · Math 5
Four operations of decimalsdecimal-four-operations · Math 5

After · used by

Percent and percent changepercent-change · Math 6

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