(b) Estimate \( 42.5-7.47+11.011 \) mentally. \( 42.5-7.47+11.011 \) is approximately equal to \( \square \) (Type a whole number.)
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To estimate \( 42.5-7.47+11.011 \) mentally, we can round the numbers to simplify our calculations. Rounding \( 42.5 \) to \( 43 \), \( 7.47 \) to \( 7.5 \), and \( 11.011 \) to \( 11 \): Now, perform the operation: \( 43 - 7.5 + 11 \) This simplifies to \( 35.5 + 11 \), which equals approximately \( 46.5 \). Since we need a whole number, we can say it is approximately \( 47 \). Thus, \( 42.5-7.47+11.011 \) is approximately equal to \( 47 \).
