Answer:
160
Explanation:
At each stage, the number to be subtracted is the product of the quotient digit and the divisor. For the box shown, that product is 10×16 = 160.
The number that goes in the box is 160.
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Additional comment
The rest of the long division calculation is shown in the attachment. Appropriate place values are shown by maintaining the vertical alignment of digits throughout the calculation. (The least-significant digit of the product of quotient digit and divisor is aligned with the quotient digit.)