Mental Arithmetic
Level
1
2
3
7/10
About
how much to pay?
≈
$
21
\approx \$21
≈
$21
≈
$
22
\approx \$22
≈
$22
≈
$
23
\approx \$23
≈
$23
≈
$
24
\approx \$24
≈
$24
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