Solve the using suitable rearrangement.
`4 xx 128 xx 5 xx 2`

Answer

To solve the expression \( 4 \times 128 \times 5 \times 2 \) using suitable rearrangement, we can follow these steps:

### Step 1: Rearrange the expression
We can rearrange the expression to group the numbers in a way that makes calculations easier. We can group \( 4 \) and \( 5 \) together and \( 128 \) and \( 2 \) together:
\[ (4 \times 5) \times (128 \times 2) \]

### Step 2: Calculate \( 4 \times 5 \)
Now, we calculate \( 4 \times 5 \):
\[ 4 \times 5 = 20 \]

### Step 3: Calculate \( 128 \times 2 \)
Next, we calculate \( 128 \times 2 \):
\[ 128 \times 2 = 256 \]

### Step 4: Multiply the results from Step 2 and Step 3
Now, we multiply the results from Step 2 and Step 3:
\[ 20 \times 256 \]

### Step 5: Calculate \( 20 \times 256 \)
To calculate \( 20 \times 256 \), we can break it down:
\[ 20 \times 256 = 20 \times (200 + 56) = (20 \times 200) + (20 \times 56) \]
Calculating each part:
\[ 20 \times 200 = 4000 \]
\[ 20 \times 56 = 1120 \]
Now, add these two results together:
\[ 4000 + 1120 = 5120 \]

### Final Answer
Thus, the final answer is:
\[ 4 \times 128 \times 5 \times 2 = 5120 \]

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