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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 “add 4.” From the box, a further arrow points to a second box which contains the operation “multiply by 2.” From this box, an arrow points to the answer 14. Under the first diagram there is a heading “Undoing.” The number 14 is followed by an arrow which points to a box. The box contains the operation “divide by 2.” From the box a further arrow with the answer 7 above it (14 ÷ 2 = 7) points to a second box. This box contains the operation “subtract 4” and a further arrow points to the answer 3 (since 7 – 4 = 3).