Use multi-base materials to represent the number. 161,200,000. 9,300,000.

To represent the numbers using multi-base materials (base-10 blocks), we break down each number into its place values.

1) For the number $161,200,000$: This number consists of: • One hundred million block • Six ten million blocks • One million block • Two hundred thousand blocks • Zero ten thousand blocks • Zero thousand blocks • Zero hundred blocks • Zero ten blocks • Zero one blocks

2) For the number $9,300,000$: This number consists of: • Nine million blocks • Three hundred thousand blocks • Zero ten thousand blocks • Zero thousand blocks • Zero hundred blocks • Zero ten blocks • Zero one blocks

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