How do you do front-end estimation for subtraction? I need the answer as fast as possible!
thank you
Okay. To do front-end subtraction you subtract the 2 highest value places. And then fill the rest of the places with zeros.
For example:
$${\mathtt{2\,310}}{\mathtt{\,-\,}}{\mathtt{1\,293}}$$
We take the 2 highest value places, which are 23 and 12
$$\mathbf{23}10-\mathbf{12}93$$
Now we subtract these two numbers.
$${\mathtt{23}}{\mathtt{\,-\,}}{\mathtt{12}} = {\mathtt{11}}$$
How fill the other place values with zeros:
$$\mathrm{11}\textit{00}$$
There we go.
Okay. To do front-end subtraction you subtract the 2 highest value places. And then fill the rest of the places with zeros.
$$8.75-5.67$$
We take the 2 highest value places, which are 8.7 and 5.6
$$\mathbf{8.7}5-\mathbf{5.6}7$$
Now we subtract these two numbers.
$${\mathtt{8.7}}{\mathtt{\,-\,}}{\mathtt{5.6}} = {\frac{{\mathtt{31}}}{{\mathtt{10}}}} = {\mathtt{3.1}}$$
How fill the other place values with zeros:
$$\mathrm{3.1}\textit{0}$$
There we go.
I don't think so Takahiro,
I think Dragon is supposed to ROUND to 2 significant figures - not just truncate!