Sticker Valley

Math · Numbers and place value

Rounding Hills: Round to the nearest 10 and 100, then estimate

A roller coaster shows rounding as a ride. The valleys are the tens (or hundreds) on either side and the peak is the halfway mark, so a number rolls down into the one it rounds to. Kids round to the nearest 10 and 100, find which number rounds to a target, then round to estimate a sum or difference.

  • Grades3rd grade
  • Levels5, from “Nearest 10 (to 100)” to “Estimate”
  • A roundAbout 10 questions, a few minutes
  • PriceWith any plan, from $7.99 a month
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A round of Rounding Hills on a phone

How Rounding Hills works

The 5 levels

  1. Nearest 10 (to 100)
  2. Nearest 10 (to 1,000)
  3. Nearest 100
  4. Which one rounds?
  5. Estimate

What it lines up with in school

Common Core State Standards for Mathematics. Standards vary by state, so check with your kid’s teacher.

3.NBT.A.1
Round whole numbers to the nearest 10 or 100.

Practice it at home

Questions about Rounding Hills

What grade is Rounding Hills for?
3rd grade. It’s a rounding game with 5 levels that move up when your kid is ready.
Which standards does Rounding Hills cover?
It lines up with Common Core math 3.NBT.A.1. Standards vary by state, so check with your kid’s teacher for the exact match.
Does my kid need to read to play Rounding Hills?
Rounding Hills doesn’t read its questions aloud yet. Questions are short and built on pictures and numbers, so most kids in 3rd grade can play on their own.
How long is a round of Rounding Hills?
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 Rounding Hills 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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