Q:

# What is the missing number in the sequence "1, 8, 27, 125, 216?"

A:

The missing number in the sequence is 64, which goes between 27 and 125. The number sequence is of cubed numbers: 1 is 1 cubed, 8 is the number 2 cubed, 27 is the number 3 cubed and 64 is the number 4 cubed.

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Credit: morebyless CC-BY 2.0

A cube number is a number that is multiplied by itself once, and then the result is multiplied by the original number once again. For example, 5 cubed would be 5 x 5 x 5. First, multiply 5 x 5, which is 25. When multiplied again, 25 x 5, the answer is 125. Cubed numbers can be visualized as blocks, such as a Rubik's cube, a 3 x 3 block that would contain 27 blocks if it could be dismantled.

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