Estimating 3-digit addition

Rounding to the nearest hundred to find approximate answers.

Create my FREE account

including a 7 day free trial of everything

Email Address

Password

Newsletter

The URBrainy email newsletter (sent every 2 weeks) provides resource updates and helpful guides for teaching and learning.

Yes, I would like to receive the URBrainy newsletter.

I agree to the Terms and Conditions and Privacy Policy

Already have an account? Sign in

Find the missing digits.

Rounding to the nearest thousand to find approximate answers.

Put the correct digits in to make the addition calculations correct.

A tricky page on multiple exchanges when adding, suitable for those confident with written addition.

The latest news, articles, and resources, sent to your inbox weekly.

URBrainy named one of the World’s Top EdTech Companies by TIME Magazine.