Mathematical thinking in the fourth grade of primary school - Training Enrollment Network

Mathematical thinking in the fourth grade of primary school

1, ( 1) 0.0 12, 0.02 1, 0. 102, 0.20 1.

(2) 1.002 、2.00 1、 10.02、20.0 1

Question 2

0.9+0.99+0.999+0.9999

=( 1-0. 1)+( 1-0.0 1)+( 1-0.00 1)+( 1-0.000 1)

= 1x 4-0. 1 1 1 1

=4-0, 1 1 1 1

=3.8889

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