Finite Math Examples

$1 - \frac{1}{4} + \frac{1}{16} - \frac{1}{64} + \frac{1}{256} - \frac{1}{1024} + \frac{1}{4096}$

Step 1

Find the common denominator.

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Step 1.1

Write $1$ as a fraction with denominator $1$ .

$\frac{1}{1} - \frac{1}{4} + \frac{1}{16} - \frac{1}{64} + \frac{1}{256} - \frac{1}{1024} + \frac{1}{4096}$

Step 1.2

Multiply $\frac{1}{1}$ by $\frac{4096}{4096}$ .

$\frac{1}{1} \cdot \frac{4096}{4096} - \frac{1}{4} + \frac{1}{16} - \frac{1}{64} + \frac{1}{256} - \frac{1}{1024} + \frac{1}{4096}$

Step 1.3

Multiply $\frac{1}{1}$ by $\frac{4096}{4096}$ .

$\frac{4096}{4096} - \frac{1}{4} + \frac{1}{16} - \frac{1}{64} + \frac{1}{256} - \frac{1}{1024} + \frac{1}{4096}$

Step 1.4

Multiply $\frac{1}{4}$ by $\frac{1024}{1024}$ .

$\frac{4096}{4096} - (\frac{1}{4} \cdot \frac{1024}{1024}) + \frac{1}{16} - \frac{1}{64} + \frac{1}{256} - \frac{1}{1024} + \frac{1}{4096}$

Step 1.5

Multiply $\frac{1}{4}$ by $\frac{1024}{1024}$ .

$\frac{4096}{4096} - \frac{1024}{4 \cdot 1024} + \frac{1}{16} - \frac{1}{64} + \frac{1}{256} - \frac{1}{1024} + \frac{1}{4096}$

Step 1.6

Multiply $\frac{1}{16}$ by $\frac{256}{256}$ .

$\frac{4096}{4096} - \frac{1024}{4 \cdot 1024} + \frac{1}{16} \cdot \frac{256}{256} - \frac{1}{64} + \frac{1}{256} - \frac{1}{1024} + \frac{1}{4096}$

Step 1.7

Multiply $\frac{1}{16}$ by $\frac{256}{256}$ .

$\frac{4096}{4096} - \frac{1024}{4 \cdot 1024} + \frac{256}{16 \cdot 256} - \frac{1}{64} + \frac{1}{256} - \frac{1}{1024} + \frac{1}{4096}$

Step 1.8

Multiply $\frac{1}{64}$ by $\frac{64}{64}$ .

$\frac{4096}{4096} - \frac{1024}{4 \cdot 1024} + \frac{256}{16 \cdot 256} - (\frac{1}{64} \cdot \frac{64}{64}) + \frac{1}{256} - \frac{1}{1024} + \frac{1}{4096}$

Step 1.9

Multiply $\frac{1}{64}$ by $\frac{64}{64}$ .

$\frac{4096}{4096} - \frac{1024}{4 \cdot 1024} + \frac{256}{16 \cdot 256} - \frac{64}{64 \cdot 64} + \frac{1}{256} - \frac{1}{1024} + \frac{1}{4096}$

Step 1.10

Multiply $\frac{1}{256}$ by $\frac{16}{16}$ .

$\frac{4096}{4096} - \frac{1024}{4 \cdot 1024} + \frac{256}{16 \cdot 256} - \frac{64}{64 \cdot 64} + \frac{1}{256} \cdot \frac{16}{16} - \frac{1}{1024} + \frac{1}{4096}$

Step 1.11

Multiply $\frac{1}{256}$ by $\frac{16}{16}$ .

$\frac{4096}{4096} - \frac{1024}{4 \cdot 1024} + \frac{256}{16 \cdot 256} - \frac{64}{64 \cdot 64} + \frac{16}{256 \cdot 16} - \frac{1}{1024} + \frac{1}{4096}$

Step 1.12

Multiply $\frac{1}{1024}$ by $\frac{4}{4}$ .

$\frac{4096}{4096} - \frac{1024}{4 \cdot 1024} + \frac{256}{16 \cdot 256} - \frac{64}{64 \cdot 64} + \frac{16}{256 \cdot 16} - (\frac{1}{1024} \cdot \frac{4}{4}) + \frac{1}{4096}$

Step 1.13

Multiply $\frac{1}{1024}$ by $\frac{4}{4}$ .

$\frac{4096}{4096} - \frac{1024}{4 \cdot 1024} + \frac{256}{16 \cdot 256} - \frac{64}{64 \cdot 64} + \frac{16}{256 \cdot 16} - \frac{4}{1024 \cdot 4} + \frac{1}{4096}$

Step 1.14

Multiply $4$ by $1024$ .

$\frac{4096}{4096} - \frac{1024}{4096} + \frac{256}{16 \cdot 256} - \frac{64}{64 \cdot 64} + \frac{16}{256 \cdot 16} - \frac{4}{1024 \cdot 4} + \frac{1}{4096}$

Step 1.15

Multiply $16$ by $256$ .

$\frac{4096}{4096} - \frac{1024}{4096} + \frac{256}{4096} - \frac{64}{64 \cdot 64} + \frac{16}{256 \cdot 16} - \frac{4}{1024 \cdot 4} + \frac{1}{4096}$

Step 1.16

Multiply $64$ by $64$ .

$\frac{4096}{4096} - \frac{1024}{4096} + \frac{256}{4096} - \frac{64}{4096} + \frac{16}{256 \cdot 16} - \frac{4}{1024 \cdot 4} + \frac{1}{4096}$

Step 1.17

Reorder the factors of $256 \cdot 16$ .

$\frac{4096}{4096} - \frac{1024}{4096} + \frac{256}{4096} - \frac{64}{4096} + \frac{16}{16 \cdot 256} - \frac{4}{1024 \cdot 4} + \frac{1}{4096}$

Step 1.18

Multiply $16$ by $256$ .

$\frac{4096}{4096} - \frac{1024}{4096} + \frac{256}{4096} - \frac{64}{4096} + \frac{16}{4096} - \frac{4}{1024 \cdot 4} + \frac{1}{4096}$

Step 1.19

Reorder the factors of $1024 \cdot 4$ .

$\frac{4096}{4096} - \frac{1024}{4096} + \frac{256}{4096} - \frac{64}{4096} + \frac{16}{4096} - \frac{4}{4 \cdot 1024} + \frac{1}{4096}$

Step 1.20

Multiply $4$ by $1024$ .

$\frac{4096}{4096} - \frac{1024}{4096} + \frac{256}{4096} - \frac{64}{4096} + \frac{16}{4096} - \frac{4}{4096} + \frac{1}{4096}$

Step 2

Combine the numerators over the common denominator.

$\frac{4096 - 1024 + 256 - 64 + 16 - 4 + 1}{4096}$

Step 3

Simplify by adding and subtracting.

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Step 3.1

Subtract $1024$ from $4096$ .

$\frac{3072 + 256 - 64 + 16 - 4 + 1}{4096}$

Step 3.2

Add $3072$ and $256$ .

$\frac{3328 - 64 + 16 - 4 + 1}{4096}$

Step 3.3

Subtract $64$ from $3328$ .

$\frac{3264 + 16 - 4 + 1}{4096}$

Step 3.4

Add $3264$ and $16$ .

$\frac{3280 - 4 + 1}{4096}$

Step 3.5

Subtract $4$ from $3280$ .

$\frac{3276 + 1}{4096}$

Step 3.6

Add $3276$ and $1$ .

$\frac{3277}{4096}$

Step 4

The result can be shown in multiple forms.

Exact Form:

$\frac{3277}{4096}$

Decimal Form:

$0.80004882 \dots$