The hardest thing about doing word problems is taking the English words and translating them into mathematics. Usually, once you get the math equation, you're fine; the actual math involved is often fairly simple. But figuring out the actual equation can seem nearly impossible. What follows is a list of key words used in word problems. Be advised, however: To really learn "how to do" word problems, you will need to practice, practice, practice.
Key Words for Subtraction Word Problems:
decreased by
minus
less
difference between/of
less than
fewer than
Source: Purplemath
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