In a place-value chart, the sequence is ?, 10, 100, 1000, what is the missing value?

• A. 1s
• B. 10s
• C. 100s
• D. 1000s

Answer: (A)

In a place-value chart, each step to the right is ten times bigger, so the columns go 1s, 10s, 100s, 1000s, and so on. The given sequence shows 10, 100, 1000 moving to the right, which means the column immediately to the left of 10s is the 1s column. The 1s column represents the value 1. So the missing value is the 1s place. The other options would be larger place-value columns that come after 1s, not before 10s in this sequence.