Learn To Be
Open menu
Enroll A Student
Become A Tutor
Partner With Us
Sign In
Close menu
Enroll A Student
Become A Tutor
Partner With Us
Sign in
Timed Test For
Add 2-digit numbers by making tens
Not ready for a timed test?
Practice this topic instead
Sample Problem
**Complete to solve $47 + 23$.** $\phantom{=}47+23$ $=(40+$[[☃ input-number 1]]$)+ 23$ $=40 + ($[[☃ input-number 2]] $+ 23)$ $=40 + $ [[☃ input-number 3]] $=$ [[☃ input-number 4]]
What's your name?
Duration
30 seconds
60 seconds (1 minute)
120 seconds (2 minutes)
180 seconds (3 minutes)
300 seconds (5 minutes)