The number usually written as a 1 followed by 9 zeros: 1,000,000,000

The same as a thousand million: 1,000 x 1,000,000 = 1,000,000,000

Using

(In some countries such as the UK it sometimes means a million million: 1,000,000 x 1,000,000 = 1,000,000,000,000 which is a 1 followed by 12 zeros, or 1 × 10

Imagine each of these little squares is worth

The same as a thousand million: 1,000 x 1,000,000 = 1,000,000,000

Using

**scientific notation**: 1 × 10^{9}(In some countries such as the UK it sometimes means a million million: 1,000,000 x 1,000,000 = 1,000,000,000,000 which is a 1 followed by 12 zeros, or 1 × 10

^{12})Imagine each of these little squares is worth

**a million dollars each**, then you have a billion dollars:
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