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Square Numbers
The number nine is special because it has a rectangle that is a
square that has three rows and three columns.
square that has three rows and three columns.
- Which other numbers have rectangles that are squares? These numbers are called square numbers.
- Find the next largest square number after 25.
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Another way mathematicians write 3 3 is 32. This is read “three to the second power” or “three squared.” The raised 2 is called an exponent. Here are some more examples:
- What is 52?
- What is 62?
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Check-In: Questions 17–18
- Write the number sentences for the rectangles you can make with 30 tiles.
- Is 30 a prime number? How do you know?
- Is 30 a square number? How do you know?
- Ming has 32 rocks in his rock collection. He wants to buy a rectangular display box with one square compartment for each rock. At the store he found boxes with 6 rows of 6 columns; 8 rows of 4 columns; 2 rows of 16 columns; and 3 rows of 10 columns. Which boxes will hold his collection with no empty compartment?
- Show or tell how you know.