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In Unknown Change problems, the middle number is the unknown number.

Example 1 - Unknown Change (minus)

162 apples were in an apple tree. A gust of wind blew the tree, and some apples fell to the ground. 124 apples remained. How many apples fell from the tree?

(Answer = 38)

Example 2 - Unknown Change (plus)

Rochester, NY received 1 foot of snow in 24 hours. Over the next few days, it continued snowing. When the skies finally cleared, there was a total accumulation of 5 feet, 6 inches of snow. How much snow fell after the first day?

(Answer = 4 feet, 6 inches)

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