Mental Arithmetic
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1
2
3
Mental Arithmetic
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1/10
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how much is this?
$8 + $21 + $49
≈
$
100
\approx \$100
≈
$100
≈
$
80
\approx \$80
≈
$80
≈
$
90
\approx \$90
≈
$90
≈
$
110
\approx \$110
≈
$110
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