Mental Arithmetic
Level
1
2
3
Mental Arithmetic
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9/10
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how much to pay?
≈
$
160
\approx \$160
≈
$160
≈
$
140
\approx \$140
≈
$140
≈
$
150
\approx \$150
≈
$150
≈
$
170
\approx \$170
≈
$170
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