Skip to content
Mente
  • Knowledge Graph
  • Testovanie 9
  • Resources
Mente

A learning platform for mathematics and physics.

Mente

  • About Me
  • Contact

Learn

  • Mathematics
  • Physics
  • Other
  • Descriptive Geometry
  • Informatics
  • Resources

Tools

  • Quiz Mode
  • Today's Review
  • Knowledge Graph
  • Testovanie 9

Tutoring

  • Tutoring

Contact

  • Emaildybalasamuel8@gmail.com
  • Instagram@takzvanychuan
  • YouTubeChuanChurka

© 2026 Mente. All rights reserved.

PrivacyTermsBuilt with Next.js · Vercel.
  1. Problems
  2. /
  3. 1.1

Problem 1.1 · Arithmetic

Two-digit addition

1/9Difficulty 1 of 9+5 XPabout 30 s

The problem

Calculate: 47 + 38

Sign in to answer

Solved problems are saved and add XP.

Sign in →
← Back to the list

The next problem unlocks when you solve this one.

How others did

100 %

of players solved it · 3 solvers

Average attempts1.3

Rules

  • 2 wrong answers in a row and the problem rests for 5 min.
  • After 5 wrong answers the reward drops by 20%.
  • You earn a problem’s XP only once.

Brush up on the topic

  • Mathematics – topic overview→
  • Visualizations – all→
  • Mathematics videos→