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4th Grade AMP 20-21Topic 16
Ratios
Written by: Juan Felipe, Ximena Alejandra, and Santiago José
A ratio is a comparison of two quantities.
You can write a ratio in three ways:
You can write a ratio in three ways:
The quantities in the ratio are called terms. The first term is
a, and the second term is b (b ≠ 0).
a, and the second term is b (b ≠ 0).
5 to 7, 5:7, or 5/7.
Arithmetic
a to b, a:b, or a/b.
Algebra
Arithmetic
a to b, a:b, or a/b.
Algebra
A ratio can compare a part to a whole, a part to another
part of the whole, or the whole to a part.
part of the whole, or the whole to a part.
A percentage is a part of a whole.
A percentage can also be a decimal and a fraction.
A present is a special kind of radio in which the first term is compared to 100% as a number of hundreds that represents the part of a whole.
The process to convert a percentage into a fraction or decimal is this one:
Or this one.
10%= 0.1= 1/10
50%= 0.5= 1/2