Squares, Square Roots, Cubes, Cube Roots, and Proportions

Step 6. Add the barrier (a line) to the left of the answer (1) to the subtraction.

Step 7. Double the entire number on top (2), write it (4) to the left of the barrier, leaving one space (place value) to the left of the barrier empty (

). Step 8. Bring down the next pair of numbers (79), putting them to the

right of the answer to the subtraction (1) of Step 5.