Mental Arithmetic
Level
1
2
3
1/10
About
how much to pay?
≈
$
4
\approx \$4
≈
$4
≈
$
8
\approx \$8
≈
$8
≈
$
10
\approx \$10
≈
$10
≈
$
6
\approx \$6
≈
$6
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