When you multiply by multiples of 10, you add 1 zero to the product.
When you multiply by multiples of 100, you add 2 zeros to the product.
Examples:
3 x 4 = 12
3 x 40 = 120
3 x 400 = 1,200
5 x 3 = 15
5 x 30 = 150
5 x 300 = 1,500
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