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What does the expression mean cream puffs on a lower shelf?
That sounds like a cooking instruction for a non-fan oven. Without a fan there are temperature zones in a [gas] oven with the lower shelves at a lower temperature than the higher shelves. In a gas cooker, the setting for gas mark is [usually] the centre shelf; the top shelf is about 1 to 11/2 gas marks higher (about 25-37oF, 14-21oC hotter), the bottom shelf is about 1 to 11/2 gas marks lower (about 25-37oF, 14-21oC cooler) - the differences will be in the cooker's manufacturer's instructions. By putting the cream puffs of a lower shelf, they are baked at a lower temperature than that at which the oven has been set, allowing the baking of something else on a higher shelf at a higher temperature at the same time.
Why is the top of an oven hotter than the bottom?
Because - hot air is lighter than cold air - and thus it rises.
Is denominator on the top or bottom?
Numerator on top; denominator on the bottom.
What is the rule in comparing a set of fractions?
the top adds what the bottom adds. the top subtracts what the bottom subtracts. the top divides what the bottom divides. the top multiplies what the bottom multiplies.
How do you reduce 12 15 into a lower fraction?
Divide top and bottom by any common factors of them. Dividing by the highest common factor of the top and bottom numbers results in the simplest form. hcf(12, 15) = 3, so divide top and bottom by 3: 12/15 = (12÷3)/(15÷3) = 4/5
