+0  
 
0
800
3
avatar+8262 

And how do you do front-end estimation for addition?

 Aug 27, 2014

Best Answer 

 #3
avatar+676 
+5

Okay. To do front-end addition you add the 2 highest value places. And then fill the rest of the places with zeros.

$$4.11+5.90+8.02$$

We take the 2 highest value places, which are 4.1 5.9 and 8.0

$$\mathbf{4.1}0+\mathbf{5.9}0+\mathbf{8.0}2$$

Now we add these three numbers.

$${\mathtt{4.1}}{\mathtt{\,\small\textbf+\,}}{\mathtt{5.9}}{\mathtt{\,\small\textbf+\,}}{\mathtt{8}} = {\mathtt{18}}$$

How fill the other place values with zeros:

$$\mathrm{18}\textit{.00}$$

There we go.

 Aug 27, 2014
 #1
avatar+676 
+5

Okay. To do front-end addition you add the 2 highest value places. And then fill the rest of the places with zeros.

For example:

$${\mathtt{2\,310}}{\mathtt{\,\small\textbf+\,}}{\mathtt{1\,293}}$$

We take the 2 highest value places, which are 23 and 12

$$\mathbf{23}10+\mathbf{12}93$$

Now we add these two numbers.

$${\mathtt{23}}{\mathtt{\,\small\textbf+\,}}{\mathtt{12}} = {\mathtt{35}}$$

How fill the other place values with zeros:

$$\mathrm{35}\textit{00}$$

There we go.

 Aug 27, 2014
 #2
avatar+8262 
0

Can you help me with this one?

4.11+5.90+8.02?

 Aug 27, 2014
 #3
avatar+676 
+5
Best Answer

Okay. To do front-end addition you add the 2 highest value places. And then fill the rest of the places with zeros.

$$4.11+5.90+8.02$$

We take the 2 highest value places, which are 4.1 5.9 and 8.0

$$\mathbf{4.1}0+\mathbf{5.9}0+\mathbf{8.0}2$$

Now we add these three numbers.

$${\mathtt{4.1}}{\mathtt{\,\small\textbf+\,}}{\mathtt{5.9}}{\mathtt{\,\small\textbf+\,}}{\mathtt{8}} = {\mathtt{18}}$$

How fill the other place values with zeros:

$$\mathrm{18}\textit{.00}$$

There we go.

TakahiroMaeda Aug 27, 2014

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