The friendly number strategy is a way to complete difficult operations by dividing them into operations using friendly numbers, or numbers that are easy to work with. For example, you could use the friendly numbers strategy to solve 169 + 37 by breaking it down into 160 + 30 + 9 + 7.
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A friendly number is a number that has a lot of factors depending on the size of the number. For example, eight is a friendly number. Its factors are 8,4,2,1. 7 isn't because its only factors are 7 and 1.
19
I think it means that you drink
13.8333
The similarity is they both use the same strategy to find a answer and the difference is they are worth different amount