Convert the decimal (base-10) number 20 to binary (base-2).

10100

Explanation:

1·2⁴ + 0·2³ + 1·2² + 0·2¹ + 0·2⁰ = 20

one approach to get to this number systematically is to divide by 2 and write down if you have a remainder. Write from right to left until you hit 0.

20 divided by 2 is 10, no remainder, write down 0

10 divided by 2 is 5, no remainder, write down 0

5 divided by 2 is 2, remainder 1, write down 1

2 divided by 2 is 1, no remainder, write down 0

1 divided by 2 is 0, remainder 1, write down 1

You have written down 10100.

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