## 孩子自主的生日聚会 Child Directed Party

• 帐篷：S\$140 from Decathlon
• 氦气桶：S\$50 from Spotlight

## Numeral Systems: Binary, Decimal & Hexadecimal

### Why?

In Singapore, mathematics syllabus for P1 (primary one) includes addition, subtraction, multiplication, and division. Students work with decimal numbers. Learning about other numeral systems than decimal, they will understand: how a numeral system work in general; why decimal is the default choice.

### How?

Scope: learning how binary (base 2), decimal (base 10) and hexadecimal (base 16) systems work starting from 0 to 26; then +5, +10, etc.

Materials: 1) A3 sized paper; 2) snap cubes: 3 colors for each student; 100 pieces per color.

Increment by 1: walking through the number increment procedure with students:

1. add one piece to the rightmost ‘ones’ column of a number system;
2. carry over if the total units exceed the current place value – start from the ‘ones’ column till to the right:
• snap the all the units of the current column in a straight line and now they form one unit in the preceding column;