Final answer:
To estimate the value of 0.784 - 0.147, subtract each digit starting from the right and fill in any missing digits with zeros. The estimated value is 0.637.
Step-by-step explanation:
To estimate the value of 0.784 - 0.147, we can subtract the decimals. Line up the decimal points and subtract each corresponding digit.
Remember to fill in any missing digits with zeros. Starting from the rightmost column, subtract 7 - 4 to get 3. Then subtract 8 - 1 to get 7.
Finally, subtract 0 - 7 to get -7. Therefore, the estimated value of 0.784 - 0.147 is 0.637.