Donate
Partner With Us
Learn To Be
Get free tutoring
Become a tutor
Sign In
Open menu
Close menu
Sign in
Enroll A Student
Become A Tutor
Partner With Us
Learn
Reading Tutoring
Math Tutoring
Tutors
Why Join Learn To Be?
Apply Now
Tutor Corps
California College Corp
Federal Work Study
Resources
Practice Problems & Worksheets
Common Core Standards
Donate
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 $41 + 9$.** $\phantom{=} 41+9$ $=(40+$ [[☃ math-keypad 1]]$)+ 9$ $=40 + ($[[☃ math-keypad 2]] $+ 9)$ $=40 + $ [[☃ math-keypad 3]] $=$ [[☃ math-keypad 4]]
Complete to solve
41
+
9
41 + 9
4
1
+
9
.
=
41
+
9
\phantom{=} 41+9
=
4
1
+
9
=
(
40
+
=(40+
=
(
4
0
+
Check Answer
)
+
9
)+ 9
)
+
9
=
40
+
(
=40 + (
=
4
0
+
(
Check Answer
+
9
)
+ 9)
+
9
)
=
40
+
=40 +
=
4
0
+
Check Answer
=
=
=
Check Answer
What's your name?
Duration
30 seconds
60 seconds (1 minute)
120 seconds (2 minutes)
180 seconds (3 minutes)
300 seconds (5 minutes)
