Mental Arithmetic
Level
1
2
3
Mental Arithmetic
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6/10
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how much to pay?
≈
$
33
\approx \$33
≈
$33
≈
$
36
\approx \$36
≈
$36
≈
$
30
\approx \$30
≈
$30
≈
$
27
\approx \$27
≈
$27
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