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Timed Test For
Add 2-digit numbers by making tens 2
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Sample Problem
**Fill in the blank.** $34+39~$ is the same as [[☃ math-keypad 1]] $+\,40$
Fill in the blank.
34
+
39
34+39~
3
4
+
3
9
is the same as
Check Answer
+
40
+\,40
+
4
0
What's your name?
Duration
30 seconds
60 seconds (1 minute)
120 seconds (2 minutes)
180 seconds (3 minutes)
300 seconds (5 minutes)
