📚 KS3 CAIE Computer Science: Formula & Theorem Quick Reference | KS3 CAIE计算机：公式定理速查手册
This quick reference handbook compiles the most important formulas, theorems and calculation methods you need for the KS3 CAIE Computer Science course. Use it to refresh your memory before tests or while completing assignments.
这本速查手册汇集了KS3 CAIE计算机科学课程中最重要的公式、定理和计算方法。你可以在考试前或完成作业时用它来快速复习。
1. Number System Conversions | 数字系统转换
To convert a binary number to decimal, sum the products of each bit with 2 raised to the power of its place value (starting from 0 on the right).
将二进制数转换为十进制，需要对每一位乘以2的位置次幂（从右起0位置）然后求和。
Decimal = Σ (binary digit × 2position)
Decimal to binary conversion uses repeated division by 2, recording the remainders.
十进制转二进制使用重复除以2，并记录余数。
| Decimal | Hexadecimal | 4-bit Binary |
|---|---|---|
| 0 | 0 | 0000 |
| 1 | 1 | 0001 |
| 2 | 2 | 0010 |
| 3 | 3 | 0011 |
| 4 | 4 | 0100 |
| 5 | 5 | 0101 |
| 6 | 6 | 0110 |
| 7 | 7 | 0111 |
| 8 | 8 | 1000 |
| 9 | 9 | 1001 |
| 10 | A | 1010 |
| 11 | B | 1011 |
| 12 | C | 1100 |
| 13 | D | Published by TutorHao | KS3 Computer Science Revision Series | aleveler.com
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