Computers store everything — numbers, words, pictures and music — using just two states: on and off, written as 1 and 0. This is binary. With a row of light bulbs, children discover how on and off can make any number.
Apa yang akan dipelajari anak anda
- Know that computers use binary: 1 for on and 0 for off
- Read numbers made from light bulbs worth 8, 4, 2 and 1
- Show a number using bulbs
- Read short binary numbers such as 101
Bulbs worth 4, 2 and 1
Line up three bulbs worth 4, 2 and 1. Switch on the 4 and the 1 and you have 4 + 1 = 5, written in binary as 101. Three bulbs can make every number from 0 to 7; add an 8 bulb and you can reach 15.
Each place is worth double the one to its right — the same idea as tens and hundreds, but with twos.
Contoh soalan
Berikut ialah beberapa soalan seperti dalam misi pertama. Bolehkah anda menjawabnya?
1. Each bulb that is on is worth 4, 2, 1 from left to right. What number do the bulbs show?
Tunjuk jawapan
Jawapan: 3. The bulbs that are on are worth 2 + 1 = 3. Bulbs that are off count for nothing.
2. Each bulb that is on is worth 4, 2, 1 from left to right. What number do the bulbs show?
- 2
- 3
- 6
- 1
Tunjuk jawapan
Jawapan: 1. Only the 1 bulb is on, so the number is 1. Bulbs that are off count for nothing.
3. Each bulb that is on is worth 4, 2, 1 from left to right. What number do the bulbs show?
Tunjuk jawapan
Jawapan: 3. The bulbs that are on are worth 2 + 1 = 3. Bulbs that are off count for nothing.
Tip untuk orang dewasa
- Use cards or cups (face up = 1, face down = 0) to make binary numbers.
- Count from 0 to 7 in binary together: 000, 001, 010, 011…