Skip to main content

This diagram has a heading “Doing.” Underneath, the word “number” is written, followed by an arrow pointing to a box. The box contains the operation “multiply by 5.” From the box, a further arrow points to the answer 35. Under the first diagram there is a heading “Undoing.” The number 35 is followed by an arrow which points to a box. The box contains the operation “divide by 5.” From the box a further arrow points to the answer 7 (since 35 divided by 5 = 7).

 9.5.2 Doing and Undoing