Use the four operations to solve two-step problems in context (within number limits for each operation as stated in 3.NOS.B and 3.NOS.D). a. Represent these problems using equations with a letter standing for the unknown quantity. b. Assess the reasonableness of answers in terms of context, using mental computation and estimation strategies including, rounding, front-end estimation, and benchmark numbers.
Example Problems
One tube holds tennis balls. Jenna filled tubes and had ball left over. Write an equation that can be used to find , the number of tennis balls.
One carton holds juice boxes. Carlos packed cartons and had juice boxes left over. Write an equation that can be used to find , the number of juice boxes.
A soccer stadium had 250 fans in the stands. After the first half, 85 fans left. Then 6 buses arrived with 12 new fans on each bus. Write an equation that can be used to find , the number of fans in the stadium now.
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