Question

1. start at 8.4. move backward 3.678. estimate: _____ exact answer: _____

Explanation:

Step1: Estimate the subtraction

To estimate, we can round 8.4 to 8 and 3.678 to 4. Then we calculate \( 8 - 4 = 4 \).

Step2: Calculate the exact answer

We need to subtract 3.678 from 8.4. We can write 8.4 as 8.400 to have the same number of decimal places. Then we do the subtraction: \( 8.400 - 3.678 = 4.722 \).

Answer:

Estimate: \( 4 \)
Exact answer: \( 4.722 \)