Question

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Explanation:

Step1: Solve \(7 \times 700\)

First, find the basic fact. The basic fact for \(7\times700\) is \(7\times7 = 49\). Then, since \(700\) has two zeros, we add two zeros to the product of the basic fact. So \(7\times700=4900\).

Step2: Solve \(3 \times 7000\)

The basic fact for \(3\times7000\) is \(3\times7 = 21\). Since \(7000\) has three zeros, we add three zeros to the product of the basic fact. So \(3\times7000 = 21000\).

Step3: Solve \(9 \times 50\) (assuming the third problem is \(9\times50\))

The basic fact for \(9\times50\) is \(9\times5 = 45\). Since \(50\) has one zero, we add one zero to the product of the basic fact. So \(9\times50=450\).

Answer:

• For \(7 \times 700\): Basic fact: \(7\times7 = 49\), \(7\times700 = 4900\)
• For \(3 \times 7000\): Basic fact: \(3\times7 = 21\), \(3\times7000 = 21000\)
• For \(9 \times 50\): Basic fact: \(9\times5 = 45\), \(9\times50 = 450\)