The sum of the tens digit and the units digit of the sum $$\(1+12+123+1234+\ldots+123456789\)$$ is
A.
4
B.
5
C.
6
D.
7
Exam No：2018 First Round Grade 3 Year：2018 Question No：34
Answer:
B
Knowledge points:
G3 - Number Sense - Place Value
Solution:
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