What must be added to 75p to make 1.50?

To find what must be added to 75p to make 1.50, you would set up the equation as 75p + x = 1.50, where x represents the unknown amount to be added. To solve for x, you would subtract 75p from both sides of the equation to isolate x. This would give you x = 1.50 - 75p. Therefore, to make 75p equal to 1.50, you would need to add 1.50 - 75p.