\begin{tabular}{l}\( 8: 13 \) ( \\ Rick is trying to find \( 140 \div 35 \). \\ Since \( 150 \div 30=5 \), he estimates the \\ quotient is around 5. \\ Check Rick's estimate. How should he adjust \\ his estimate? \\ Since \( 5 \times 35<140 \), he \\ should try numbers greater \\ than 5. \\ Since \( 5 \times 35>140 \), he \\ should try numbers less \\ than 5. \\ Since \( 5 \times 35=140 \), he \\ does not need to adjust his \\ estimate. \\ Adjust Rick's estimate as needed and find \\ the quotient. \\ \( 140 \div 35=\square \) \\ \hline\end{tabular}
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Mind Expander
To check Rick's estimate, we perform the division directly. Calculating \( 140 \div 35 \) gives us 4, because \( 4 \times 35 = 140 \). Therefore, Rick's initial estimate of 5 was too high, and he needs to adjust his estimate downwards. To clarify this, when estimating, rounding the numbers can really help! For this problem, rounding 140 to 150 and 35 to 30 led Rick to an inaccurate conclusion. By focusing on exact numbers, we can see that it's important to check our work and adjust our estimates accordingly for accuracy!