What grade is Sink or Float for?

Kindergarten to 2nd grade. It’s a materials game with 5 levels that move up when your kid is ready.

Which standards does Sink or Float cover?

It lines up with NGSS science 2-PS1-1 and 2-PS1-2. Standards vary by state, so check with your kid’s teacher for the exact match.

Does my kid need to read to play Sink or Float?

No. Every question is read aloud, so kids who are still learning to read can play on their own.

How long is a round of Sink or Float?

About 10 questions, a few minutes. Nine right on the first try and the next round is a level harder; a tough round steps back one.

Is Sink or Float free?

It comes with every plan, from $7.99 a month, with a 7-day free trial. Number Garden and Gator Compare are free.

Science · Forces and matter

Sink or Float: Sink or float, materials and their properties

Things drop into a clear water tank with a splash. Kids predict sink or float, name what things are made of, describe properties like hard or bendy, pick the best material for a job, and see how shape changes whether something floats.

GradesKindergarten, 1st grade, 2nd grade
Levels5, from “Sink or float?” to “Shape matters”
A roundAbout 10 questions, a few minutes
PriceWith any plan, from $7.99 a month

Try it free for 7 days See plans and prices

How Sink or Float works

Questions are read aloud, so kids who are still learning to read can play on their own.
A wrong answer shows why, with the picture or the steps, and then they try again.
Nine right on the first try and the next round is a level harder. A tough round steps back one.
Each game they play builds a spot in their own valley, and stars go in their sticker book.

The 5 levels

Sink or float?
Materials
Properties
Best for the job
Shape matters

What it lines up with in school

Next Generation Science Standards. Standards vary by state, so check with your kid’s teacher.

2-PS1-1: Sort materials by their observable properties.
2-PS1-2: Test which materials have the properties best suited for a job.

Practice it at home

Fill the sink and test things from around the house. Guess first, then drop them in.
Shape foil into a ball and into a boat, and see which one floats.

Questions about Sink or Float

What grade is Sink or Float for?: Kindergarten to 2nd grade. It’s a materials game with 5 levels that move up when your kid is ready.
Which standards does Sink or Float cover?: It lines up with NGSS science 2-PS1-1 and 2-PS1-2. Standards vary by state, so check with your kid’s teacher for the exact match.
Does my kid need to read to play Sink or Float?: No. Every question is read aloud, so kids who are still learning to read can play on their own.
How long is a round of Sink or Float?: About 10 questions, a few minutes. Nine right on the first try and the next round is a level harder; a tough round steps back one.
Is Sink or Float free?: It comes with every plan, from $7.99 a month, with a 7-day free trial. Number Garden and Gator Compare are free.

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