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A soda is 90 calories. How many calories are in 6 sodas

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2 Answers

This can be answered using multiplication.
 
90 X 6 = 540.
 
A strategy to solving this problem is to ignore the "zero" on the 90 and just multiply 9 X 6 = 54.  Then add the zero back on for an answer of 540 calories.
 
This can be used with any number ending in zero/zeros.
 
For example:
 
A candy bar has 50 calories.  How many calories in 5 candy bars?
 
5 X 5 = 25.  Then add the zero for an answer of 250 calories.
 
Example:
 
A candy bar has 500 calories.  How many in 5 candy bars?
 
5 X 5 = 25.  Then add the two zeros and the answer is 2,500 calories.