It depends on what base the original 777 is in!
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This would be 7 times 64 (8^2) + 7 times 8 + 7 = 511.
Writing a number in standard form simply means to express the number in its 'normal' form. Therefore, your example is written in standard form as: 777
33 777
6900 in decimal form is simply 6900. Decimal form refers to the base-10 numbering system that we commonly use, where each place value is a power of 10. In this case, the number 6900 is already in decimal form, as it is written using the digits 0-9 in the base-10 system.
4 * 4 * 4 * 4 (i.e. 44) = 256 (base 10). In base 2 (binary) this is:100000000.Which is 28.