✔ 最佳答案
When dealing with mathematics, one of the tricks is to ensure that the numbers represent the same thing, like apples, SO one apple + one apples = 2 apples or one orange + one orange = two oranges, but one apple + one orange is NOT two apples or two oranges.
To be able to add them together, we have tofind a way of making the apples and oranges the same --- call then fruit:
so one fruit + one fruit = two fruit
In this problem we are dealing with fractions, In fractions, the denominators (the number under the short line) are like apples and oranges
1/12 is NOT the same as 1/36
How can we make these comparable?
well, 36 = 3 * 12
hence 1/2 = 3/36
so is 5/12 less than 16/36?
that's like comparing 5 lots of 3/36 which is the same as 15 lots of 1/36 to 16 lots of 1/36
or asking " is 15/36 less than 16/36?" (yes, 15 is less than 16).
do the same with the others.
3/7 = 15/35 vs 16/35 (yes, 15 is less than 16).
7/13 = 21/39 vs 22/39 (yes, 21 is less than 22).
10/11 = 30/33 vs 29/33 (no, 30 is greater than 29.
)hope this helps....