Compatible numbers for 2.4 and –0.18 are 2.5 and –0.2. What is the estimation of the product of (2.4)(–0.18) using these compatible numbers?

Use the compatible numbers 2.5 and −0.2 to estimate the product: 2.5 × (−0.2) = −0.5. A positive number times a negative number gives a negative result, so the estimate is −0.5, choice A.

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