In this lesson, you will learn how to take away 3 and 4 on your soroban when there aren't enough/any 'one' beads left to complete your sums, but the 'heaven' or 'five' bead is available. To take away 3 (-3), take away five (-5) and add two 'one' beads. -3 = -5 + 2. To take away 4 (-4), take away five (-5) and add one 'one' bead. -4 = -5 + 1.