Greene Sanders
08/21/2023 · Primary School

Use properties and mental math to sub \( \begin{array}{l} 382.5-141.9= \\ 382.5-+0.1=240.5 \\ +0.5\end{array} \) \( \begin{aligned} 382.5-141.9 & = \\ 382.5-\square & =240.5 \\ \square+0.1 & =\square\end{aligned} \)

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To solve the subtraction \( 382.5 - 141.9 \) using properties and mental math, we can break it down step by step. 1. **Estimate the subtraction**: - We can round \( 141.9 \) to \( 142 \) for easier mental calculation. - So, \( 382.5 - 142 \) is approximately \( 240.5 \). 2. **Exact calculation**: - Now, let's calculate \( 382.5 - 141.9 \) directly. - We can break it down as follows: \[ 382.5 - 141.9 = 382.5 - 141.0 - 0.9 \] - First, calculate \( 382.5 - 141.0 \): \[ 382.5 - 141.0 = 241.5 \] - Now subtract \( 0.9 \): \[ 241.5 - 0.9 = 240.6 \] 3. **Using properties**: - We can also express the subtraction in terms of a missing number: \[ 382.5 - \square = 240.6 \] - To find \( \square \), we can rearrange the equation: \[ \square = 382.5 - 240.6 \] - Now calculate \( 382.5 - 240.6 \): \[ 382.5 - 240.6 = 141.9 \] 4. **Final result**: - Therefore, the exact result of \( 382.5 - 141.9 \) is \( 240.6 \). So, the final answer is: \[ 382.5 - 141.9 = 240.6 \]

Quick Answer

\( 382.5 - 141.9 = 240.6 \)
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