4.OA.A.2

Multiply or divide to solve contextual problems involving multiplicative comparison, and distinguish multiplicative comparison from additive comparison. For example, school A has 300 students and school B has 600 students: to say that school B has two times as many students is an example of multiplicative comparison; to say that school B has 300 more students is an example of additive comparison.

Example Problems
Greg has 132 coins in his piggy bank, with 1 quarter for every 2 dimes.

How many dimes are in the piggy bank?
Javier painted 144 tiles for a mosaic, with 7 white tiles for every 5 black tiles.
How many white tiles did he paint?
Hannah's fruit basket contains 80 pieces of fruit, with 3 apples for every 5 oranges.

How many oranges are in the basket?
Khan Academy Resources
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