4.OA.2
Multiply or divide to solve word problems involving multiplicative comparisons by using drawings and equations with a symbol for the unknown number to represent the problem, distinguishing multiplicative comparison from additive comparison. (MP.1, MP.2, MP.3)
Example Problems
At a store, 3 notebooks cost $5.25.
At the same rate, how much will 11 notebooks cost?
At the same rate, how much will 11 notebooks cost?
In a field, 20 sprinklers can water 5 acres of land.
At the same rate, how many acres can 8 sprinklers water?
At the same rate, how many acres can 8 sprinklers water?
In a school band, the ratio of flutes to clarinets is 5 to 8.
If there are 20 flutes, how many clarinets are there?
If there are 20 flutes, how many clarinets are there?
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