64 x 64 = 64^2 is also equal to 8 x 8 x 8 x 8 = 8^4
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Exponential notation is a useful way of writing big numbers. Exponential notation means "to the power of...". For example: 24 means 2x2x2x2 (2 times itself three times) 10^8 (another way of writing exponential notation) means 100000000 (1 with 8 zeros after it).
If you write it as 1010, you already have exponential notation. If you want scientific notation, you might want to add "1" in front of it, to get: 1 x 1010. In exponential shorthand notation, used a lot in computers, this would be written as 1e10.
It is: 2 times 7^4 = 4802
2 × 2 × 2 = 2³ (2 cubed).
83. The index 3 shows that 8 is multiplied three times.