Trigonometry Examples

$90 - 71.5$

Step 1

Subtract using long subtraction.

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Step 1.1

Set up the subtraction problem in long subtraction format.

Step 1.2

Borrow $10$ from the digit in the next column to the left. Add the borrowed $10$ to $0$ . Reduce the number that was borrowed from by $1$ .

Step 1.3

Subtract $5$ from $10$ .

Step 1.4

Borrow $10$ from the digit in the next column to the left. Add the borrowed $10$ to $- 1$ . Reduce the number that was borrowed from by $1$ .

Step 1.5

Subtract $1$ from $9$ .

Step 1.6

Subtract $7$ from $8$ .

Step 2

The result of $90 - 71.5$ is $18.5$ .

$18.5$