Mental Arithmetic
Level
1
2
3
4/10
About
how much to pay?
≈
$
11
\approx \$11
≈
$11
≈
$
10
\approx \$10
≈
$10
≈
$
13
\approx \$13
≈
$13
≈
$
12
\approx \$12
≈
$12
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