Skip to main content

Atlas
Problems
Diagnostic
Mock
Papers
About

The whole Atlas

Number & Arithmetic15
Counting18
Geometry & Visualization18
Logic & Deduction11
Patterns & Sequences7
Modeling & Word Problems10
Contest Craft12

Loading…

About
Sign in
Worksheets
Privacy
Terms
License
Contact
GitHub

Code is MIT. Problems, skills, and explanations are CC BY-NC-SA 4.0. Practice never requires an account and nothing here is paywalled.

Independent project. Not affiliated with or endorsed by Math Kangaroo in USA, NFP.

Home
Atlas
Problems
Papers

Atlas
/
Clever regrouping (pair to round numbers)
/
3-point ladder

Clever regrouping (pair to round numbers), 3-point ladder

●○○3 points, difficulty 1 of 33 pt

One step from a skill you know.

3 in a row to finish this ladder.

0/1 solved

KA-0057

about 60s

What is 1 + 2 + 3 + ... + 20?