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Timed Test For
Add 2-digit numbers by making tens
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Sample Problem
**Complete to solve $29+ 51$.** $\phantom{=}29+51$ $=(20+$ [[☃ math-keypad 1]]$)+ 51$ $=20 + ($[[☃ math-keypad 2]] $+ $ $51)$ $=20 + $ [[☃ math-keypad 3]]$$ $=$ [[☃ math-keypad 4]]
Complete to solve
29
+
51
29+ 51
2
9
+
5
1
.
=
29
+
51
\phantom{=}29+51
=
2
9
+
5
1
=
(
20
+
=(20+
=
(
2
0
+
Check Answer
)
+
51
)+ 51
)
+
5
1
=
20
+
(
=20 + (
=
2
0
+
(
Check Answer
+
+
+
51
)
51)
5
1
)
=
20
+
=20 +
=
2
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)
